Openstack client allows to see quotas for server groups and server group members but doesn't provide a way to update them:

root@node-3:~# openstack quota set --server-groups 100 admin
usage: openstack quota set [-h] [--class] [--properties <properties>]
                              [ --ram <ram>] [--secgroup-rules <secgroup-rules>]
                              [ --instances <instances>] [--key-pairs <key-pairs>]
                              [ --fixed- ips <fixed-ips>] [--secgroups <secgroups>]
                              [ --injected- file-size <injected- file-size> ]
                              [ --floating- ips <floating-ips>]
                              [ --injected- files <injected-files>]
                              [ --cores <cores>]
                              [ --injected- path-size <injected- path-size> ]
                              [ --gigabytes <gigabytes>] [--volumes <volumes>]
                              [ --snapshots <snapshots>]
                              [ --volume- type <volume-type>]
                              < project/ class>
openstack quota set: error: unrecognized arguments: --server-groups admin