Mostly fixes related to using failover MDSs along lmv. This is also related to...

Mostly fixes related to using failover MDSs along lmv. This is also related to active_ref handling, etc.

Also fixed the following:
* name of lproc entry where lustre upcall can be seen in error message if upcall is failed.
* removed --master option which was supposed to work along with lmv and now it is obsoleted.
* clanups and fixes both in lconf and lmc