The unit test didn't correctly check that the configuration file name
hasn't changed when the configuration context was copied.

Bundy issue 6:
(should also be trivial enough, so I'm pushing it directly at my discretion)
without this it's possible that it only results in warning on a system
that doesn't actually support this flag (such as MacOS X) and subsequently
causes build failure.

[mavericks] fix trivial build errors

Conflicts:
	src/lib/util/csv_file.cc
	src/lib/util/csv_file.h

Conflicts:
	src/lib/dhcpsrv/d2_client_cfg.cc
	src/lib/dhcpsrv/dhcp_parsers.cc

Reverted change to configure.ac that broke the test for sys/filio.h.
This include is needed for unit tests in dhcp_ddns.

The unit test, IOFetchTest.TcpSendReceive65535, was failing
routinely on a NetBSD VM.  The VM was running so slowly that
this test was timing out.  Typically it takes less than
500ms. On this VM it was taking over 4.5s and then hitting
a safety valve timeout.  That timeout value was increased.

Internal refactor, moved error logic from commit() to build() for
D2 parsers

Adds sender_ip,sender_port,max_queue_size to D2 client config

Fixed typos and replaced used of DHCPv<n> with b10-dhcp<n> in
D2 relevant sections of the admin guide.
Added sender_ip and max_queue_size value to dhcp4 and dhcp6 unit
tests.
Added used of DFT constants in D2ClientCfg default constructor.

Added suggested code commentary.

Out of the box both DHCP servers should look at the same defualt address
for D2, as D2 only opens one ip/port (currently).