BUG#12403008 RPL_HEARTBEAT_BASIC FAILS SPORADICALLY ON PUSHBUILD

      
rpl_heartbeat_basic test fails sporadically on pushbuild because did
not received all heartbeats from slave in circular replication.

Removed from experimental collection.

mysql-test/collections/default.experimental

@@ -12,7 +12,6 @@ main.signal_demo3 @solaris               # Bug#11753919 2010-01-20 alik Several
 main.sp @solaris                         # Bug#11753919 2010-01-20 alik Several test cases fail on Solaris with error Thread stack overrun
 main.wait_timeout @solaris               # Bug#11758972 2010-04-26 alik wait_timeout fails on OpenSolaris
 
-rpl.rpl_heartbeat_basic                  # BUG#12403008 2011-04-27 sven fails sporadically
 rpl.rpl_innodb_bug28430                  # Bug#11754425
 rpl.rpl_row_sp011  @solaris              # Bug#11753919 2011-07-25 sven Several test cases fail on Solaris with error Thread stack overrun