Update rax module DOCUMENTATION with new auth options

library/cloud/rax

@@ -26,6 +26,49 @@ options:
   api_key:
     description:
       - Rackspace API key (overrides I(credentials))
+    aliases:
+      - password
+  auth_endpoint:
+    description:
+      - The URI of the authentication service
+    default: https://identity.api.rackspacecloud.com/v2.0/
+    version_added: 1.5
+  credentials:
+    description:
+      - File to find the Rackspace credentials in (ignored if I(api_key) and
+        I(username) are provided)
+    default: null
+    aliases:
+      - creds_file
+  env:
+    description:
+      - Environment as configured in ~/.pyrax.cfg,
+        see U(https://github.com/rackspace/pyrax/blob/master/docs/getting_started.md#pyrax-configuration)
+    version_added: 1.5
+  identity_type:
+    description:
+      - Authentication machanism to use, such as rackspace or keystone
+    default: rackspace
+    version_added: 1.5
+  region:
+    description:
+      - Region to create an instance in
+    default: DFW
+  tenant_id:
+    description:
+      - The tenant ID used for authentication
+    version_added: 1.5
+  tenant_name:
+    description:
+      - The tenant name used for authentication
+    version_added: 1.5
+  username:
+    description:
+      - Rackspace username (overrides I(credentials))
+  verify_ssl:
+    description:
+      - Whether or not to require SSL validation of API endpoints
+    version_added: 1.5
   auto_increment:
     description:
       - Whether or not to increment a single number with the name of the
@@ -43,12 +86,6 @@ options:
       - number count to start at
     default: 1
     version_added: 1.4
-  credentials:
-    description:
-      - File to find the Rackspace credentials in (ignored if I(api_key) and
-        I(username) are provided)
-    default: null
-    aliases: ['creds_file']
   disk_config:
     description:
       - Disk partitioning strategy
@@ -103,18 +140,11 @@ options:
         or C(label).
     default: ['public', 'private']
     version_added: 1.4
-  region:
-    description:
-      - Region to create an instance in
-    default: DFW
   state:
     description:
       - Indicate desired state of the resource
     choices: ['present', 'absent']
     default: present
-  username:
-    description:
-      - Rackspace username (overrides I(credentials))
   wait:
     description:
       - wait for the instance to be in state 'running' before returning