MFC: r269851,r272076,r274884,r282328,r285644,r286503,r286504,r286505,
r286506,r286510,r286561,r286562,r287034

Update svnlite from 1.8.10 to 1.8.14, and the support components:
serf->1.3.8, apr->1.5.2, apr-util->1.5.4, sqlite3->3.8.11.1

This includes syncing the developer templates with head.

MFC r266728,266731,266735,266736,268135,268960,269833
Update apr 1.4.8 -> 1.5.1
Update apr-util 1.5.2 -> 1.5.3
Update serf 1.3.4 -> 1.3.7
Update svnlite 1.8.8 -> 1.8.10
Deal with svnlite.1 manpage.

MFC r262324: serf 1.3.4 - improve SSL handling with svn-1.8.8 and other
speedups and quality of life fixes.

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

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

Update serf 1.2.1 -> 1.3.0 for svn

Introduce svnlite so that we can check out our source code again.

This is actually a fully functional build except:
* All internal shared libraries are static linked to make sure there
is no interference with ports (and to reduce build time).
* It does not have the python/perl/etc plugin or API support.
* By default, it installs as "svnlite" rather than "svn".
* If WITH_SVN added in make.conf, you get "svn".
* If WITHOUT_SVNLITE is in make.conf, this is completely disabled.

To be absolutely clear, this is not intended for any use other than
checking out freebsd source and committing, like we once did with cvs.

It should be usable for small scale local repositories that don't
need the python/perl plugin architecture.

Import serf-1.2.1