- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.2.
- Update default pkg(8) configuration to use the quarterly branch.[1]

Discussed with: re, portmgr [1]
Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC: r274011,r274022,r274453,r274542,r274632,r274727,r275653,r275656,r275657,
r275658,r275829,r277652,r277764,r278475,r278767,r278819,r278902,r279256,
r282681,r282683,r282685,r282686,r282687,r282697,r282698,r282699,r282700,
r282709,r282712,r282713,r282716,r282718,r282719,r282720,r282721,r283809,
r283810,r283811,r283814,r283815,r283816,r283818,r283841,r283842,r283843,
r283961,r283962,r284110,r284111,r284112,r284113,r284114,r284117,r284118,
r284119,r284120,r284121,r284122,r284123,r284124,r284126,r284128,r284129,
r284130,r284133,r284135,r284137,r284139,r284140,r284148,r284149,r284392

Lots of cleanup in the pw(8) code
Add pw -R <rootdir>
Add lots of regression tests
More accurate error messages

Approved by: re (kib)
Sponsored by: gandi.net

Break out the tests into a file per command and clean up some long lines

Approved by: will

Add more tests for pw(8) useradd.

PR: 195832
Submitted by: Robert O'Neil <oneil.rs@gmail.com>
Approved by: will