- 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 r274328:
Make both iSCSI initiator and target support base64 encoded CHAP data.

While all tested initiators and targets use hex-encoded CHAP data, RFC also
allows base64 encoding there, and Microsoft certificaition tool uses it.

MFC r273459:

Untangle iSCSI authentication code by splitting off the CHAP
implementation.

Sponsored by: The FreeBSD Foundation

Untangle iSCSI authentication code by splitting off the CHAP
implementation.

Reviewed by: mav@
MFC after: 1 month
Sponsored by: The FreeBSD Foundation