Added tests for `UPDATE_QUOTA`.
Added tests for `UPDATE_QUOTA`.

These tests reuse the existing tests for `SET_QUOTA` and
`REMOVE_QUOTA` calls. In general, `UPDATE_QUOTA` request
should fail where `SET_QUOTA` fails. When the existing
test expects `SET_QUOTA` call succeeds, we test the
`UPDATE_QUOTA` call by first remove the set quota and then
send the `UPDATE_QUOTA` request.

Review: https://reviews.apache.org/r/71022

kaysoky/mesos,kaysoky/mesos,chhsia0/mesos,reneploetz/mesos,reneploetz/mesos,abudnik/mesos,dforsyth/mesos,dforsyth/mesos,kaysoky/mesos,Gilbert88/mesos,abudnik/mesos,reneploetz/mesos,dforsyth/mesos,Gilbert88/mesos,chhsia0/mesos,kaysoky/mesos,abudnik/mesos,chhsia0/mesos,dforsyth/mesos,kaysoky/mesos,dforsyth/mesos,kaysoky/mesos,chhsia0/mesos,chhsia0/mesos,dforsyth/mesos,Gilbert88/mesos,reneploetz/mesos,Gilbert88/mesos,abudnik/mesos,kaysoky/mesos,reneploetz/mesos,chhsia0/mesos,Gilbert88/mesos,chhsia0/mesos,abudnik/mesos,reneploetz/mesos,abudnik/mesos,abudnik/mesos,reneploetz/mesos,Gilbert88/mesos,dforsyth/mesos,Gilbert88/mesos