Improve pc-sysinstall for pkgng 1.2.x, when doing installations from
local media, we can avoid doing a "pkg install", since it does unnecessary
steps of copying the media from DVD -> DISK -> INSTALL. Instead we will
do a 'pkg rquery' to get the filename of the requested package, and
install it with 'pkg add' which will stream from the DVD/USB directly.
Merge branch 'master' of github.com:pcbsd/pcbsd