Cleaning up policy documentation

Change-Id: I125f6c81235c6a1519044dd6145636693530277c
Closes-bug: #1220778
Remove extra blank line

Change-Id: Ib5d0d21a1d6d560c7a8d2d6c533e42fa56d8249a
Retrieve security group quotas from Neutron if enabled

Secuirty group quota information in Project overview charts,
Admin defaults panel, and Admin create/update project is
retrieved from Neutron secuirty group is enabled.

Neutron security group is enbled when Neutron is used Neutron
security group extension is supported by a backend plugin.

Also removes the logic to remove quotas of floating IP and fixed IP
when neutron is enabled in dashboards/admin/defaults/tabs.py.
quotas.get_default_quota_data() already handles it properly
and this logic is no longer required.

Closes-Bug: #1212600

Change-Id: I59f069931fad519ca4ec135b92df0040ec8fc230
Merge "Cleaning up policy documentation"
Merge "Remove extra blank line"