pgsql: Change vacuum lazy "compacting" warning message to:

Log Message:
-----------
Change vacuum lazy "compacting" warning message to:

errhint("Consider using VACUUM FULL on this relation or increasing the configuration parameter \"max_fsm_pages\".")));

Modified Files:
--------------
pgsql/src/backend/commands:
vacuumlazy.c (r1.82 -> r1.83)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/vacuumlazy.c.diff?r1=1.82&r2=1.83)