Removed duplicated mtr warning suppressions

mysql-test/include/mtr_warnings.sql

@@ -185,14 +185,6 @@ INSERT INTO global_suppressions VALUES
  ("Master server does not support or not configured semi-sync replication, fallback to asynchronous"),
  (": The MySQL server is running with the --secure-backup-file-priv option so it cannot execute this statement"),
  ("Slave: Unknown table 't1' Error_code: 1051"),
- /*
-   Transient network failures that cause warnings on reconnect.
-   BUG#47743 and BUG#47983.
- */
- ("Slave I/O: Get master SERVER_ID failed with error:.*"),
- ("Slave I/O: Get master clock failed with error:.*"),
- ("Slave I/O: Get master COLLATION_SERVER failed with error:.*"),
- ("Slave I/O: Get master TIME_ZONE failed with error:.*"),
 
  /* Messages from valgrind */
  ("==[0-9]*== Memcheck,"),