- 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 Intel I40E drivers: r274205,r274218, and r274228
The MFC was pushed early as it fixes a panic in the
exiting driver of 10.1 that Intel discovered in validation.

Add header file missing from last commit.

Submitted by: jfv
MFC after: 1 week