Make more dashboard options configurable

This change adds the following new attributes:

node['openstack']['dashboard']['password_autocomplete']
node['openstack']['dashboard']['neutron']['enable_lb']
node['openstack']['dashboard']['neutron']['enable_quotas']

Changing these will be reflected in the local_settings.py
configuration file.

Note that there are additional neutron options, however I've opted to
only do enable_lb and enable_quotas as we have a load balancer recipe
in the network cookbook, and enable_quotas defaults to True.  The
remaining neutron options can also be turned into attributes if/when we
support that functionality.

Change-Id: I6fd9f7df58f46861c6fa8d8c6ed502fb554d951e
Merge "Make more dashboard options configurable"