Disallow limit in /quota requests and SET_QUOTA calls.
Disallow limit in /quota requests and SET_QUOTA calls.

This ensures that after the protobuf changes to introduce limit
are committed, users cannot set limit in the existing API.

Review: https://reviews.apache.org/r/65851

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