HBASE-18867 update maven enforcer plugin.
HBASE-18867 update maven enforcer plugin.

Signed-off-by: Mike Drob <7d5db5eeae20c13a709f5640b51f5c63dc0a2d15@apache.org>

HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase