There exists a method in the management API to change the quota
for a given resource. This change exposes that API via a new
"trove quota-update" command. Also, adds v1.Quotas to the python
client.
Note that this command requires admin privileges.
Partial implements: blueprint bp/quota-management
Change-Id: I6ca1a87fbc46781f83bc9b7bd33745783b8aaab1