PF_BLUETOOTH protocols: skip initialization of non-virtualized globals
for non-default VNET instances.

This fixes panic on a vnet initialization when ng_btsocket is loaded.

MFC after:	1 week
vt fontcvt: move to usr.bin/vtfontcvt

vtfontcvt is useful for end users to convert arbitrary bitmap fonts
for use by vt(4).  It can also be used as a build tool, allowing us
to keep the source font data in the src tree rather than uuencoded
binaries.

Reviewed by:	ray, wblock (D183)
Sponsored by:	The FreeBSD Foundation