Also update the test Makefile.am files to include the appropriate libraries.

On some compilers, use of typeid() requires that RTTI is explicitly
specified on the compiler command line.  For an isc::Exception message,
the file and line number will identify the exception.  For a message
output caused by std::exception, the what() should identify the exception.

... and catch both isc::Exception and std::exception.

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.