trivial, okayed on jabber.

Change note about IXFR support. Noticed by Jelte and discussed on
jabber.

While here: mention AXFR and IXFR, remove a TODO comment, and
add some docbook formatting tags (no content change for that).

- Fixed distcheck complaining about file left in src/bin/dhcp4
- Fixed socket binding problem in src/lib/dhcp/tests/iface_mgr
- Fixed OSError problem in src/bin/dhcp6/tests/dhcp6_test.py on NetBSD

I fixed three conflicts.

In addition to merge this also updates new bin/dhcp4 to use libdhcp++.la.

Change Secondary Manager chapter to a section in the
existing Incoming Zone Transfers chapter.

Small content addition and add a bindctl example for Zonemgr.

TODO: this still needs reload_jitter documented

Conflicts:
	ChangeLog
	src/bin/dhcp6/dhcp6_srv.cc
	src/lib/dhcp/iface_mgr.cc
	src/lib/dhcp/pkt4.h
	src/lib/dhcp/tests/iface_mgr_unittest.cc
	src/lib/dhcp/tests/pkt4_unittest.cc

Conflicts:
	src/lib/statistics/counter_dict.cc
	src/lib/statistics/counter_dict.h
	src/lib/statistics/tests/counter_dict_unittest.cc

okayed on jabber.

fix a typo

use a tab before the keyword type.

use two tabs before the committer username.

line is too long

Patch introduces use of SPECFILE_LOCATION in the tests, which only gets the correct value within the source tree if B10_FROM_BUILD is set when calling the test