Bug 1607376 - have the libvirt VM do VM-local locking. r=kats
Bug 1607376 - have the libvirt VM do VM-local locking. r=kats

With local_lock=all both flock and posix locks happen only within the
VM.  This is consistent with how we expect the VM to be used and avoids
the VM trying to do the locking via NLM.

bill-mccloskey/searchfox,bill-mccloskey/searchfox,bill-mccloskey/searchfox,bill-mccloskey/searchfox,bill-mccloskey/searchfox,bill-mccloskey/searchfox