Bug#19890 mysqltest: "query" command is broken

 - Allow "query" to be used as a prefix for focing a command to be sent to server
 - Add testcases

client/mysqltest.c

@@ -4757,6 +4757,14 @@ int main(int argc, char **argv)
 	  q->require_file=require_file;
 	  save_file[0]=0;
 	}
+        /*
+          To force something being sent as a query to the mysqld one can
+          use the prefix "query". Remove "query" from string before executing
+        */
+        if (strncmp(q->query, "query ", 6) == 0)
+        {
+          q->query= q->first_argument;
+        }
 	run_query(&cur_con->mysql, q, flags);
 	query_executed= 1;
         q->last_argument= q->end;

mysql-test/r/mysqltest.result

@@ -441,3 +441,9 @@ select-me
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'insertz error query' at line 1
 drop table t1;
 drop table t1;
+sleep;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'sleep' at line 1
+sleep;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'sleep' at line 1
+;
+ERROR 42000: Query was empty

mysql-test/t/mysqltest.test

@@ -1125,3 +1125,18 @@ drop table t1;
 drop table t1;
 
 
+#
+# Bug#19890  	mysqltest: "query" command is broken
+#
+
+# It should be possible to use the command "query" to force mysqltest to
+# send the command to the server although it's a builtin mysqltest command.
+--error 1064
+query sleep;
+
+--error 1064
+--query sleep
+
+# Just an empty query command
+--error 1065
+query ;