GitLab

Conflicts:
	src/lib/log/README
	src/lib/log/logger_support.cc
	src/lib/log/messagedef.cc
	src/lib/log/messagedef.h
	src/lib/log/messagedef.mes
	src/lib/log/tests/logger_support_test.cc
	src/lib/log/tests/run_time_init_test.sh.in

Also updated some message IDs - since the message logged now includes the
prefix, there is no need to suggest the prefix in the ID itself (e.g.
MSGRDERR now becomes READERR as it will be output as MSG_READERR).

Basic changes to get the code to read the new-style message files.
In addition, a suggestion made on the bind10-dev list - to add the
prefix to the symbols in the symbol dictionary (and not just to the
C++ symbols) has been implemented. (This minimises the chances of
polluting symbol namespace.)  As a result, multiple $PREFIX directives
can be supported.

Cherry-pick from #744

Conflicts:
	ChangeLog

Conflicts:
	src/lib/dns/tests/tsigrecord_unittest.cc

This reverts commit b8422db8.

re-adding the change for merge

This reverts commit da16cc77.

Re-adding it as a form of merging to master.

The behavior of the unittest module was changed in the face of a
test exiting, so we need to use os._exit() instead of sys.exit()
to terminate.

manually reviewed
also used my check-changelog script.