Add new “salt.formulas” state to manage salt formulas

This state downloads formulas from git repositories and ensures
that they are recorded in the file_roots setting.

pillar.example

@@ -73,3 +73,41 @@ salt_cloud_certs:
       -----BEGIN RSA PRIVATE KEY-----
       ...........
       -----END RSA PRIVATE KEY-----
+
+salt_formulas:
+  git_opts:
+    # The Git options can be customized differently for each
+    # environment, if an option is missing in a given environment, the
+    # value from "default" is used instead.
+    default:
+      # URL where the formulas git repositories are downloaded from
+      # it will be suffixed with <formula-name>.git
+      baseurl: https://github.com/saltstack-formulas
+      # Directory where Git repositories are downloaded
+      basedir: /srv/formulas
+      # Update the git repository to the latest version (False by default)
+      update: False
+      # Options passed directly to the git.latest state
+      options:
+        rev: master
+    dev:
+      basedir: /srv/formulas/dev
+      update: True
+      options:
+        rev: develop
+  # Options of the file.directory state that creates the directory where
+  # the git repositories of the formulas are stored
+  basedir_opts:
+    makedirs: True
+    user: root
+    group: root
+    mode: 755
+  # List of formulas to enable in each environment
+  list:
+    base:
+      - salt-formula
+      - postfix-formula
+    dev:
+      - salt-formula
+      - postfix-formula
+      - openssh-formula