fix mysql process monitoring and puppet run on pc

I100a7adb4211b7fc6f0e7a37471010d4371a795b introduced
a bug that caused puppet runs to break on mysql servers,
f.e. on pc2:

err: Could not retrieve catalog from remote server: Error 400 on SERVER:
Invalid parameter nrpe_command at
/etc/puppet/modules/mysql_wmf/manifests/init.pp:19

this should be nrpe::monitor_service for both of them

Change-Id: Ib7411cadba127ca018bc5406ada4bf1e4643dd50