fix(pkgrepo): provide settings for `amazon`

salt/osfamilymap.yaml

         install_from_source: false
 
 RedHat:
+  pkgrepo_name: saltstack
+  pkgrepo_humanname: SaltStack repo for RHEL/CentOS $releasever
   pkgrepo: 'https://repo.saltstack.com/{{ py_ver_repr }}/redhat/$releasever/$basearch/{{ salt_release }}'
   key_url: 'https://repo.saltstack.com/{{ py_ver_repr }}/redhat/$releasever/$basearch/{{ salt_release }}/SALTSTACK-GPG-KEY.pub'
   pygit2: python-pygit2

salt/osmap.yaml

 Fedora:
   pygit2: python2-pygit2
 
+Amazon:
+  pkgrepo_name: saltstack-amzn-repo
+  pkgrepo_humanname: SaltStack repo for Amazon Linux 2
+  pkgrepo: 'https://repo.saltstack.com/yum/amazon/2/$basearch/{{ salt_release }}'
+  key_url: 'https://repo.saltstack.com/yum/amazon/2/$basearch/{{ salt_release }}/SALTSTACK-GPG-KEY.pub'
+
 Ubuntu:
   pkgrepo: 'deb http://repo.saltstack.com/{{ py_ver_dir }}/{{ os_lower }}/{{ osrelease }}/amd64/{{ salt_release }} {{ oscodename }} main'
   key_url: 'https://repo.saltstack.com/{{ py_ver_dir }}/{{ os_lower }}/{{ osrelease }}/amd64/{{ salt_release }}/SALTSTACK-GPG-KEY.pub'

salt/pkgrepo/redhat/install.sls

 # -*- coding: utf-8 -*-
 # vim: ft=sls
-{% from "salt/map.jinja" import salt_settings with context %}
+{%- from "salt/map.jinja" import salt_settings with context %}
 
-  {%- if grains['os']|lower not in ('amazon', 'fedora') %}
+{%- if grains['os']|lower not in ['fedora'] %}
 salt-pkgrepo-install-saltstack-redhat:
   pkgrepo.managed:
-    - name: saltstack
-    - humanname: SaltStack repo for RHEL/CentOS $releasever
+    - name: {{ salt_settings.pkgrepo_name }}
+    - humanname: {{ salt_settings.pkgrepo_humanname }}
     - baseurl: {{ salt_settings.pkgrepo }}
     - enabled: 1
     - gpgcheck: 1
     - gpgkey: {{ salt_settings.key_url }}
-  {% endif %}
+    {%- if grains['os']|lower in ['amazon'] %}
+    - failovermethod: priority
+    - priority: 10
+    {%- endif %}
+{%- endif %}