use already available home variable for user's ssh-key configuration

users/init.sls

 {%- if user == None -%}
 {%- set user = {} -%}
 {%- endif -%}
-{%- set home = user.get('home', "/home/%s" % name) -%}
+{%- set current = salt.user.info(name) -%}
+{%- set home = user.get('home', current.get('home', "/home/%s" % name)) -%}
 
 {%- if 'prime_group' in user and 'name' in user['prime_group'] %}
 {%- set user_group = user.prime_group.name -%}
   user.present:
     - name: {{ name }}
     - home: {{ home }}
-    - shell: {{ user.get('shell', users.get('shell', '/bin/bash')) }}
+    - shell: {{ user.get('shell', current.get('shell', users.get('shell', '/bin/bash'))) }}
     {% if 'uid' in user -%}
     - uid: {{ user['uid'] }}
     {% endif -%}
       'ssh_config' in user %}
 user_keydir_{{ name }}:
   file.directory:
-    - name: {{ user.get('home', '/home/{0}'.format(name)) }}/.ssh
+    - name: {{ home }}/.ssh
     - user: {{ name }}
     - group: {{ user_group }}
     - makedirs: True
   {% set key_type = 'id_' + user.get('ssh_key_type', 'rsa') %}
 users_user_{{ name }}_private_key:
   file.managed:
-    - name: {{ user.get('home',
-                  '/home/{0}'.format(name)) }}/.ssh/{{ key_type }}
+    - name: {{ home }}/.ssh/{{ key_type }}
     - user: {{ name }}
     - group: {{ user_group }}
     - mode: 600
       {% endfor %}
 users_user_{{ name }}_public_key:
   file.managed:
-    - name: {{ user.get('home',
-                  '/home/{0}'.format(name)) }}/.ssh/{{ key_type }}.pub
+    - name: {{ home }}/.ssh/{{ key_type }}.pub
     - user: {{ name }}
     - group: {{ user_group }}
     - mode: 644
 {% for key_name, pillar_name in user['ssh_keys_pillar'].items() %}
 user_ssh_keys_files_{{ name }}_{{ key_name }}_private_key:
   file.managed:
-    - name: {{ user.get('home',
-                  '/home/{0}'.format(name)) }}/.ssh/{{ key_name }}
+    - name: {{ home }}/.ssh/{{ key_name }}
     - user: {{ name }}
     - group: {{ user_group }}
     - mode: 600
       {% endfor %}
 user_ssh_keys_files_{{ name }}_{{ key_name }}_public_key:
   file.managed:
-    - name: {{ user.get('home',
-                  '/home/{0}'.format(name)) }}/.ssh/{{ key_name }}.pub
+    - name: {{ home }}/.ssh/{{ key_name }}.pub
     - user: {{ name }}
     - group: {{ user_group }}
     - mode: 644