tmf: Consider compilation warnings to be errors in tmf.ui

tmf: Consider compilation warnings to be errors in tmf.ui

Now that we have eliminated all compiler warnings in the code,
we could turn on "-Werror" to make sure no new warnings are
introduced (Hudson CI would fail building any Gerrit patch that
has warnings).

NLS warnings remain as warnings, so that they can be suppressed in
Messages or constants classes.

This patch landed one week too late to prevent deprecation warnings
from entering the code... so usage of deprecated methods methods remain
as warnings in tmf.ui.

Change-Id: I9bea653ef2cef3435273647e6de249076a64478a
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/14207
Tested-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
IP-Clean: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
IP-Clean: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>