Fix indentation in policy doc

Few generated policy doc are not in horizontal
indentation.

Wrapping the policy doc string to have good indentation
in generated sample policy file.

Change-Id: Ia5576ded7bb4a449484a9d687fc2cd4fa724119a
Implements: blueprint policy-docs

nova/policies/agents.py

@@ -27,8 +27,8 @@ agents_policies = [
         base.RULE_ADMIN_API,
         """Create, list, update, and delete guest agent builds
 
-This is XenAPI driver specific. It is used to force the upgrade of the
-XenAPI guest agent on instance boot.
+This is XenAPI driver specific.
+It is used to force the upgrade of the XenAPI guest agent on instance boot.
 """,
         [
             {

nova/policies/hide_server_addresses.py

@@ -24,11 +24,11 @@ hide_server_addresses_policies = [
         'is_admin:False',
         """Hide server's 'addresses' key in the server response.
 
-This set the 'addresses' key in the server response to an empty dictionary
-when the server is in a specific set of states as defined in
-CONF.api.hide_server_address_states.
-By default 'addresses' is hidden only when the server is in 'BUILDING'
-state.""",
+This set the 'addresses' key in the server response to an empty
+dictionary when the server is in a specific set of states as
+defined in CONF.api.hide_server_address_states.
+By default 'addresses' is hidden only when the server is in
+'BUILDING' state.""",
         [
             {
                 'method': 'GET',

nova/policies/hypervisors.py

@@ -29,11 +29,12 @@ hypervisors_policies = [
 
 This rule will be checked for the following APIs:
 
-List all hypervisors, list all hypervisors with details, show summary
-statistics for all hypervisors over all compute nodes, show details for a
-hypervisor, show the uptime of a hypervisor, search hypervisor by
-hypervisor_hostname pattern and list all servers on hypervisors that can match
-the provided hypervisor_hostname pattern.""",
+List all hypervisors, list all hypervisors with details, show
+summary statistics for all hypervisors over all compute nodes,
+show details for a hypervisor, show the uptime of a hypervisor,
+search hypervisor by hypervisor_hostname pattern and list all
+servers on hypervisors that can match the provided
+hypervisor_hostname pattern.""",
         [
             {
                 'path': '/os-hypervisors',

nova/policies/volumes.py

@@ -27,8 +27,9 @@ volumes_policies = [
         base.RULE_ADMIN_OR_OWNER,
         """Manage volumes for use with the Compute API.
 
-Lists, shows details, creates, and deletes volumes and snapshots. These APIs
-are proxy calls to the Volume service. These are all deprecated.
+Lists, shows details, creates, and deletes volumes and
+snapshots. These APIs are proxy calls to the Volume service.
+These are all deprecated.
 """,
        [
            {