fix: make necessary modifications to get working on `salt-ssh`

* https://freenode.logbot.info/saltstack-formulas/20200506#c3811885-c3812572
* Avoid `defaults.merge`
* Send template values by `context`, to avoid:

```python
      ID: logrotate-config
Function: file.managed
    Name: /etc/logrotate.conf
  Result: False
 Comment: An exception occurred in this state: Traceback (most recent call last):
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/utils/templates.py", line 394, in render_jinja_tmpl
              output = template.render(**decoded_context)
            File "/var/tmp/.root_08c4d3_salt/pyall/jinja2/environment.py", line 1008, in render
              return self.environment.handle_exception(exc_info, True)
            File "/var/tmp/.root_08c4d3_salt/pyall/jinja2/environment.py", line 780, in handle_exception
              reraise(exc_type, exc_value, tb)
            File "/var/tmp/.root_08c4d3_salt/pyall/jinja2/_compat.py", line 37, in reraise
              raise value.with_traceback(tb)
            File "<template>", line 1, in top-level template code
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/utils/jinja.py", line 193, in get_source
              raise TemplateNotFound(template)
          jinja2.exceptions.TemplateNotFound: logrotate/map.jinja

          During handling of the above exception, another exception occurred:

          Traceback (most recent call last):
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/state.py", line 1981, in call
              **cdata['kwargs'])
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/loader.py", line 1977, in wrapper
              return f(*args, **kwargs)
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/states/file.py", line 3037, in managed
              **kwargs
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/modules/file.py", line 4846, in check_managed_changes
              **kwargs)
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/modules/file.py", line 4287, in get_managed
              **kwargs)
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/utils/templates.py", line 169, in render_tmpl
              output = render_str(tmplstr, context, tmplpath)
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/utils/templates.py", line 443, in render_jinja_tmpl
              trace=tracestr)
          salt.exceptions.SaltRenderError: Jinja error: logrotate/map.jinja
          Traceback (most recent call last):
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/utils/templates.py", line 394, in render_jinja_tmpl
              output = template.render(**decoded_context)
            File "/var/tmp/.root_08c4d3_salt/pyall/jinja2/environment.py", line 1008, in render
              return self.environment.handle_exception(exc_info, True)
            File "/var/tmp/.root_08c4d3_salt/pyall/jinja2/environment.py", line 780, in handle_exception
              reraise(exc_type, exc_value, tb)
            File "/var/tmp/.root_08c4d3_salt/pyall/jinja2/_compat.py", line 37, in reraise
              raise value.with_traceback(tb)
            File "<template>", line 1, in top-level template code
            File "/var/tmp/.root_08c4d3_salt/pyall/salt/utils/jinja.py", line 193, in get_source
              raise TemplateNotFound(template)
          jinja2.exceptions.TemplateNotFound: logrotate/map.jinja

          ; line 1

          ---
          {%- from "logrotate/map.jinja" import logrotate with context -%}    <======================
          {%- set config = salt['pillar.get']('logrotate:default_config', logrotate.default_config) -%}

          {%- set processed_parameters = [] -%}

          {%- macro set_parameter(parameter, default=None) -%}
          [...]
```

logrotate/config.sls

@@ -11,6 +11,8 @@ logrotate-config:
     - user: {{ salt['pillar.get']('logrotate:config:user', logrotate.user) }}
     - group: {{ salt['pillar.get']('logrotate:config:group', logrotate.group) }}
     - mode: {{ salt['pillar.get']('logrotate:config:mode', '644') }}
+    - context:
+        logrotate: {{ logrotate|tojson }}
 
 logrotate-directory:
   file.directory:

logrotate/map.jinja

@@ -1,25 +1,28 @@
 # -*- coding: utf-8 -*-
 # vim: ft=jinja
 
-{% import_yaml 'logrotate/defaults.yaml' as default_settings %}
-{% import_yaml "logrotate/osfamilymap.yaml" as os_family_map %}
-{% import_yaml "logrotate/osmap.yaml" as os_map %}
+{%- import_yaml "logrotate/defaults.yaml" as default_settings %}
+{%- import_yaml "logrotate/osfamilymap.yaml" as osfamilymap %}
+{%- import_yaml "logrotate/osmap.yaml" as osmap %}
 
-{% set osfam = salt['grains.filter_by'](
-    os_family_map,
-    grain='os_family',
-    ) or {} %}
-{% set os = salt['grains.filter_by'](
-    os_map,
-    grain='os',
-    ) or {} %}
-
-{% do salt['defaults.merge'](default_settings['logrotate'], osfam) %}
-{% do salt['defaults.merge'](default_settings['logrotate'], os) %}
-
-{% set logrotate = salt['pillar.get'](
-    'logrotate:lookup',
-    default=default_settings['logrotate'],
-    merge=True,
-    ) %}
+{#- Retrieve the config dict only once #}
+{%- set _config = salt['config.get']('logrotate', default={}) %}
+{%- set defaults = salt['grains.filter_by'](
+      default_settings,
+      default='logrotate',
+      merge=salt['grains.filter_by'](
+        osfamilymap,
+        grain='os_family',
+        merge=salt['grains.filter_by'](
+          osmap,
+          grain='os',
+          merge=salt['grains.filter_by'](
+            _config,
+            default='lookup'
+          )
+        )
+      )
+    )
+%}
 
+{%- set logrotate = defaults %}

logrotate/templates/logrotate.conf.tmpl

@@ -1,4 +1,3 @@
-{%- from "logrotate/map.jinja" import logrotate with context -%}
 {%- set config = salt['pillar.get']('logrotate:default_config', logrotate.default_config) -%}
 
 {%- set processed_parameters = [] -%}