add support for managing users that can ssh to a node via key

pillar/users/init.sls

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+# users pillar goes here
+users:

pillar/users/pillar.example

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+users:
+  sclapton:
+    # required fields
+    status: present
+    # node_access determines which node types the user can access.
+    # this can either be by grains.role or by final part of the minion id after the _
+    node_access:
+      - standalone
+      - searchnode
+    # optional fields
+    - fullname: Stevie Claptoon
+    - uid: 1001
+    - gid: 1001
+    - homephone: does not have a phone
+    groups:
+      - mygroup1
+      - mygroup2
+      - wheel # give sudo access
+      

pillar/users/pillar.usage

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+users:
+  sclapton:
+    # required fields
+    status: <present | absent>
+    # node_access determines which node types the user can access.
+    # this can either be by grains.role or by final part of the minion id after the _
+    node_access:
+      - standalone
+      - searchnode
+    # optional fields
+    - fullname: <string>
+    - uid: <integer>
+    - gid: <integer>
+    - roomnumber: <string>
+    - workphone: <string>
+    - homephone: <string>
+    groups:
+      - <string>
+      - <string>
+      - wheel # give sudo access