Problem:
-------
The mutex related metrics are always shown as 0 in the output
of "SHOW ENGINE INNODB STATUS OUTPUT"

Fix:
---
Since the mutex metrics are shown as part of "SHOW ENGINE INNODB
MUTEX", remove the line which always shows mutex metrics as 0

This line (from SHOW ENGINE INNODB STATUS OUTPUT): "Mutex spin waits 0,
rounds 0, OS waits 0" will be removed.

Reviewed-by: Sunny Bains <sunny.bains@oracle.com>
RB: 9417