Add option to pmp-check-mysql-replication-running to support delayed slaves

Add option to pmp-check-mysql-replication-running to support delayed slaves so those with pt-slave-delay still get alerted when replication is broken.

Currently with pt-slave-delay slave status looks like this:

Slave_IO_Running: Yes
Slave_SQL_Running: No
Last_Error:

if the Slave_SQL_Running is not running but there are no errors add an option so that does not trigger an alert.

But if Last_Error does have anything that should always be an alerts as it is currently:

NOTE=$(awk '$1 ~ /_Running:|Last_Error:/
{print substr($0, 1, 100)}

' "$
{TEMP}")
if grep 'Last_Error: .' "${TEMP}

" >/dev/null 2>&1; then
NOTE="CRIT $NOTE"