Include /usr/local/etc/libmap.d/ by default.

PR:		180568
Reviewed by:	bapt
Obtained from:	kib
MFC after:	3 days
Moved clearing of vmm_initialized to avoid the case
of unloading the module while VMs existed. This would
result in EBUSY, but would prevent further operations
on VMs resulting in the module being impossible to
unload.

Submitted by:   Tycho Nightingale (tycho.nightingale <at> plurisbusnetworks.com)
Reviewed by:	grehan, neel