Switch to using pkg(8) for the doc install in bsdinstall(8).
This also bootstraps the system with pkg(8) for future use.

PR:		183488
Submitted by:	Joe Ennis
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Make the powerpc dumpsys() more consistent with the other architectures.

MFC after:	10.0-RELEASE