[TMF] Don't swallow exception in Batch import "startUpdateTask"

[TMF] Don't swallow exception in Batch import "startUpdateTask"

One of the tasks in Batch import swallows exceptions making it much more
difficult to figure out what went wrong. Another one was being printed
to standard output.

Change-Id: Ife9c61dee1e57db4af11986739b712ca43c1f7c9
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/17675
Tested-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
IP-Clean: Matthew Khouzam <matthew.khouzam@ericsson.com>