pkgbase: Add a FreeBSD-pkg-bootstrap package

And put pkg and its keys in it.
It's easier for small image to depend on this package rather than the
larger utilities one.

MFC after:	2 weeks
Sponsored by:	Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D33458

release/packages/Makefile.package

@@ -87,6 +87,8 @@ nfs_COMMENT=		NFS Utilities
 nfs_DESC= 		NFS Utilities
 openssl_COMMENT=	OpenSSL Library and Utility
 openssl_DESC=		OpenSSL Library and Utility
+pkg-bootstrap_COMMENT=	pkg bootstrap Utility
+pkg-bootstrap_DESC=	pkg bootstrap Utility
 periodic_COMMENT=	Periodic Utility
 periodic_DESC=		Periodic Utility
 rc_COMMENT= 		RC Scripts

share/keys/pkg/trusted/Makefile

@@ -1,6 +1,6 @@
 # $FreeBSD$
 
-PACKAGE=	utilities
+PACKAGE=	pkg-bootstrap
 
 FILES=	pkg.freebsd.org.2013102301
 

usr.sbin/pkg/Makefile

@@ -1,5 +1,7 @@
 # $FreeBSD$
 
+PACKAGE=	pkg-bootstrap
+
 _BRANCH!=	${MAKE} -C ${SRCTOP}/release -V BRANCH
 BRANCH?=	${_BRANCH}
 .if ${BRANCH:MCURRENT} != ""