Add mem_watcher to PROGRAMS in gpMgmt makefile
Add mem_watcher to PROGRAMS in gpMgmt makefile

In the commit 6473841 we added mem_watcher gpMgmt/bin.
However it was not copied to the installers.
This changes ensures that it is copied to $GPHOME/bin

Authored-by: Bhanu Kiran Atturu <34831a3875dd5a8cf54ac898700bb048083d00cc@vmware.com>

50wu/gpdb,lisakowen/gpdb,lisakowen/gpdb,xinzweb/gpdb,50wu/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,lisakowen/gpdb,50wu/gpdb,xinzweb/gpdb,greenplum-db/gpdb,50wu/gpdb,50wu/gpdb,lisakowen/gpdb,xinzweb/gpdb,50wu/gpdb,lisakowen/gpdb,xinzweb/gpdb,greenplum-db/gpdb,xinzweb/gpdb,lisakowen/gpdb,xinzweb/gpdb,lisakowen/gpdb,greenplum-db/gpdb,xinzweb/gpdb,xinzweb/gpdb,greenplum-db/gpdb,50wu/gpdb,greenplum-db/gpdb,50wu/gpdb,greenplum-db/gpdb,lisakowen/gpdb