Update CI docs for -drivers to -milestone rename.

Change-Id: I6df3c4f6dac6337ab87cabd05dbd94766ad7ef1d
Reviewed-on: https://review.openstack.org/25425
Reviewed-by: Anita Kuno <akuno@lavabit.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins
Rename all -drivers to -milestone in Gerrit ACLs.

Change-Id: I62b805541dd631a0ea946c04ca07e74c9b7a1dd7
Reviewed-on: https://review.openstack.org/25423
Reviewed-by: Anita Kuno <akuno@lavabit.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins