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Sending notifications over msgq.

No receiving end yet.

this should fix test failures reported by buildbots.  confirmed, committing
at my discretion.

there seems to be a portability issue without it.

This disables the test to receive data over a closed socket on BSD systems.
The 8.1-RELEASE version of FreeBSD has a bug which causes select() not to
return EBADF error code when invalid socket descriptor is provided. The
bug number is kern/155606.

The socket function returns socket descriptor on success and value of -1
on error. This implies that 0 is a valid socket descriptor and the unit
test which verifies it should treat 0 as success. Previous version of
IfaceMgr unit test expected positive result.

Conflicts:
	src/lib/dhcp/Makefile.am

So it is the same as in the ipc-high.txt.

it's described in the context of findZone() method.

added a note on the numbering.
and made one piggyback cleanup: define public static const explicitly.

The ETHERTYPE_IP is defined in different header files on different OSes.
Since it is just a single constant that is needed, it is not practical
to locate the proper header file in configure.ac to pull single constant.

Clarify few points in the method's doxygen comment.

The group prefix is now lower-case.