cbcollect does not collect lsof information for memcached

Cbcollect currently runs the following command to capture the lsof output for the machine:

 echo moxi memcached beam.smp couch_compact godu sigar_port cbq-engine indexer projector goxdcr | xargs -n1 pgrep | xargs -n1 -r -- lsof -n -p 

However, as part of MB-16688, all memcached threads are named 'mc:<purpose of thread>:<thread_num>', as such this lsof command will not actually retrieve any of the open files in use by any of the memcached threads, this needs to be updated so that it appropriately gathers the information for all memcached threads.