Git: Suppress for-each-ref

Another plumbing command

Change-Id: I1450baae370e46e8daf5c440def7e9f04d9d01bb
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
VCS: Introduce NoOutput command flag

Suppresses all kinds of output

Change-Id: I3bd2173fc3efcfcc2ce7434d9545cd1492d7c0ab
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Git: Suppress log output in LogChangeWidget

It's distracting

Change-Id: I6c522ee61ba7261611002bf40c01a9d1d23a0259
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Git: Suppress "No local commits" error message in Push to Gerrit

Change-Id: Ib0cf79acf48d24848fda92a8b7b06efe62b46dbc
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>