Editable default quota support

Implement blueprint edit-default-quota

DocImpact

Using the class quotas named `default` as the default editable quotas.

We can use the following novaclient command to update default quota:

nova quota-class-update default <key> <value>

Change-Id: I5a5001fadcbd61d550ebd5bdc33613b0ffdf29b2
Added attribute 'ip' to server search options.

Allows all tenants to use attribute 'ip' in server search options.
For this fix, added attribute 'ip' to server search options.
Modified the existing test case to verify 'ip' search for all tenants.

Implements: blueprint add-attribute-ip-in-server-search-options

Change-Id: Ic24ee67d729f77d56c4fe3e1d4110865550c2154
Merge "Added attribute 'ip' to server search options."
Merge "Editable default quota support"