Fixes for two test failures in Buildbot.

- Adjust timing in test case, to avoid test failures caused by high load
   on machines and consequent race conditions in the test case.

 - Add another variant of Valgrind suppressions for memory leak in system
   libraries when unloading dynamic object files.


mysql-test/r/information_schema.result:
  Adjust timing to avoid test failures due to races.
mysql-test/t/information_schema.test:
  Adjust timing to avoid test failures due to races.
mysql-test/valgrind.supp:
  Add another variant of valgrind suppression for leak in system libs.

mysql-test/r/information_schema.result

@@ -1386,7 +1386,7 @@ who
 other connection here
 SELECT IF(`time` > 0, 'OK', `time`) AS time_low,
 IF(`time` < 1000, 'OK', `time`) AS time_high,
-IF(time_ms > 1500, 'OK', time_ms) AS time_ms_low,
+IF(time_ms >= 1000, 'OK', time_ms) AS time_ms_low,
 IF(time_ms < 1000000, 'OK', time_ms) AS time_ms_high
 FROM INFORMATION_SCHEMA.PROCESSLIST
 WHERE ID=@tid;

mysql-test/t/information_schema.test

@@ -1114,7 +1114,7 @@ eval SET @tid=$ID;
 --enable_query_log
 SELECT IF(`time` > 0, 'OK', `time`) AS time_low,
        IF(`time` < 1000, 'OK', `time`) AS time_high,
-       IF(time_ms > 1500, 'OK', time_ms) AS time_ms_low,
+       IF(time_ms >= 1000, 'OK', time_ms) AS time_ms_low,
        IF(time_ms < 1000000, 'OK', time_ms) AS time_ms_high
   FROM INFORMATION_SCHEMA.PROCESSLIST
  WHERE ID=@tid;

mysql-test/valgrind.supp

@@ -468,6 +468,26 @@
    fun:_ZL13plugin_dl_delPK19st_mysql_lex_string
 }
 
+{
+   dlclose memory loss from plugin variant 8
+   Memcheck:Leak
+   fun:calloc
+   fun:_dlerror_run
+   fun:dlclose
+   fun:_Z15free_plugin_memP12st_plugin_dl
+   fun:_Z13plugin_dl_delPK19st_mysql_lex_string
+}
+
+{
+   dlclose memory loss from plugin variant 9
+   Memcheck:Leak
+   fun:calloc
+   fun:_dlerror_run
+   fun:dlclose
+   fun:_ZL15free_plugin_memP12st_plugin_dl
+   fun:_ZL13plugin_dl_delPK19st_mysql_lex_string
+}
+
 {
    dlopen / ptread_cancel_init memory loss on Suse Linux 10.3 32/64 bit ver 1
    Memcheck:Leak