[PATCH] Disable mysql_upgrade test (Bug#28560)

Index: ndb-work/mysql-test/t/disabled.def
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mysql-test/t/disabled.def:
  Disable mysql_upgrade test (Bug#28560)

mysql-test/t/disabled.def

@@ -40,3 +40,4 @@ synchronization          : Bug#24529  	Test 'synchronization' fails on Mac pushb
 #rpl_ndb_dd_advance	 : Bug#25913 rpl_ndb_dd_advance fails randomly
 
 ndb_partition_error2	 : HF is not sure if the test can work as internded on all the platforms
+mysql_upgrade		 : Bug#28560 test links to /usr/local/mysql/lib libraries, causes non-determinism and failures on ABI breakage