re 36818: rpl_server_id1 fails expecting slave has stopped

On a slow environment like valgrind the test is vulnerable
because it does not check if slave has stopped at time
of the new session is requested `start slave;' -- disabling
test till it is fixed.

mysql-test/suite/rpl/t/disabled.def:
  disable rpl_server_id1 until test is fixed.

mysql-test/suite/rpl/t/disabled.def

@@ -12,3 +12,4 @@
 
 rpl_redirect               : Failure is sporadic and and the test is superfluous (mats)
 rpl_innodb_bug28430        : Failure on Solaris Bug #36793
+rpl_server_id1             : Bug #36818 rpl_server_id1 fails expecting slave has stopped (azundris)