- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r272777,r272779,r272780,r272781,r272782,r272783,r272784,r272787,r272788:

r272777:

Integrate usr.sbin/nmtree/tests from NetBSD into atf/kyua

In collaboration with: pho
Sponsored by: EMC / Isilon Storage Division

r272779:

Integrate usr.sbin/basename/tests from NetBSD into atf/kyua

In collaboration with: pho
Sponsored by: EMC / Isilon Storage Division

r272780:

Integrate usr.bin/cmp/tests from NetBSD into atf/kyua

In collaboration with: sjg
Sponsored by: EMC / Isilon Storage Division

r272781:

Integrate usr.bin/dirname/tests from NetBSD into atf/kyua

In collaboration with: pho, sjg
Sponsored by: EMC / Isilon Storage Division

r272782:

Integrate bin/sleep/tests from NetBSD into atf/kyua

Sponsored by: EMC / Isilon Storage Division

r272783:

Integrate usr.bin/cut/tests from NetBSD into atf/kyua

Sponsored by: EMC / Isilon Storage Division

r272784:

Integrate usr.bin/grep/tests from NetBSD into atf/kyua

Sponsored by: EMC / Isilon Storage Division

r272787:

Integrate usr.bin/diff/tests from NetBSD into atf/kyua at gnu/usr.bin/diff/tests

Sponsored by: EMC / Isilon Storage Division

r272788:

Integrate usr.bin/gzip/tests from NetBSD into atf/kyua

Sponsored by: EMC / Isilon Storage Division

Integrate usr.bin/diff/tests from NetBSD into atf/kyua at gnu/usr.bin/diff/tests

Sponsored by: EMC / Isilon Storage Division