Fix memory leak in mysql_ssl_set() when called more than once.

Fix sleep() synchronisation in innodb_information_schema test case.

mysql-test/t/innodb_information_schema.test:
  Using sleep for synchronisation does not work!!!
  Replace by looping until the required condition is met.
sql-common/client.c:
  mysql_ssl_set() did not free old pointers before overwriting with new ones (happens when
  mysql_ssl_set() is called twice without calling mysql_close() in-between).
  
  This sometimes caused memory leaks in the slave depending on exact timing of
  master/slave shutdown.
  
  Fixed by freeing old pointers before installing new ones in mysql_ssl_set(), just like
  mysql_options() does.

mysql-test/t/innodb_information_schema.test

@@ -109,14 +109,19 @@ SELECT * FROM ```t'\"_str` WHERE c1 = '3' FOR UPDATE;
 -- send
 SELECT * FROM ```t'\"_str` WHERE c1 = '4' FOR UPDATE;
 
-# Give time to the above 2 queries to execute before continuing.
-# Without this sleep it sometimes happens that the SELECT from innodb_locks
+-- connection con_verify_innodb_locks
+
+# Loop, giving time for the above 2 queries to execute before continuing.
+# Without this, it sometimes happens that the SELECT FROM innodb_locks
 # executes before some of them, resulting in less than expected number
 # of rows being selected from innodb_locks.
--- sleep 0.1
+SET @counter := 0;
+while (`SELECT (@counter := @counter + 1) <= 50 AND COUNT(*) != 14 FROM INFORMATION_SCHEMA.INNODB_LOCKS`)
+{
+  sleep 0.1;
+}
 
 -- enable_result_log
--- connection con_verify_innodb_locks
 SELECT lock_mode, lock_type, lock_table, lock_index, lock_rec, lock_data
 FROM INFORMATION_SCHEMA.INNODB_LOCKS ORDER BY lock_data;
 

sql-common/client.c

@@ -1585,6 +1585,11 @@ mysql_ssl_set(MYSQL *mysql __attribute__((unused)) ,
 {
   DBUG_ENTER("mysql_ssl_set");
 #ifdef HAVE_OPENSSL
+  my_free(mysql->options.ssl_key, MYF(MY_ALLOW_ZERO_PTR));
+  my_free(mysql->options.ssl_cert, MYF(MY_ALLOW_ZERO_PTR));
+  my_free(mysql->options.ssl_ca, MYF(MY_ALLOW_ZERO_PTR));
+  my_free(mysql->options.ssl_capath, MYF(MY_ALLOW_ZERO_PTR));
+  my_free(mysql->options.ssl_cipher, MYF(MY_ALLOW_ZERO_PTR));
   mysql->options.ssl_key=    strdup_if_not_null(key);
   mysql->options.ssl_cert=   strdup_if_not_null(cert);
   mysql->options.ssl_ca=     strdup_if_not_null(ca);