Implement Azure RM creds and inventory

* Vendor ansible's azure_rm inventory script
* Add new inventory type
* Add new credential type
* Expand host instance_id column from varchar 100 to 1024 to accept the
  long instance ids returned by Azure
* Make the inventory_import azure match rename more explicit.

awx/plugins/inventory/azure_rm.ini.example

@@ -0,0 +1,19 @@
+#
+# Configuration file for azure_rm_invetory.py
+# 
+[azure]
+# Control which resource groups are included. By default all resources groups are included.
+# Set resource_groups to a comma separated list of resource groups names.
+#resource_groups=
+
+# Control which tags are included. Set tags to a comma separated list of keys or key:value pairs
+#tags=
+
+# Include powerstate. If you don't need powerstate information, turning it off improves runtime performance.
+include_powerstate=yes
+
+# Control grouping with the following boolean flags. Valid values: yes, no, true, false, True, False, 0, 1.
+group_by_resource_group=yes
+group_by_location=yes
+group_by_security_group=no
+group_by_tag=yes