- 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 r264400,r265836:

r264400:

NO_MAN= has been deprecated in favor of MAN= for some time, go ahead
and finish the job. ncurses is now the only Makefile in the tree that
uses it since it wasn't a simple mechanical change, and will be
addressed in a future commit.

r265836:

Remove last two NO_MAN= in the tree. In both of these cases, MAN= is
what is needed.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Upgrade jail(2) to latest jail(2) API to make the regression test work
again. Eventually should switch to jail_set(2).

Reported by: rwatson
MFC after: 10 days

Style: NO_MAN doesn't need any value.

Change jail IP from 1.0.0.127 to 127.0.0.1, which shows, that this test
doesn't examine the real issue as it pass without problems.

Use WARNS?= instead of WARNS= in Makefiles so that global warning
settings can override local ones.

Pointed out by: ru

In refactoring the test before committing, a pointer was passed instead
of a structure for the sockaddr_in. Pass the pointer to connect()
instead of the pointer to the pointer.

Specify a port number to connect to.

Add udpconnectjail, a simple regression test to exercise an (as yet)
unfixed bug in the jail() implementation relating to using the connect()
system call on UDP sockets.

PR: 26506