Sort branches by name for content assist
I recently noticed that auto completion for branch names (e.g. in the
push branch wizard) lists them in a non recognizable order. This changes
the content assist list to be sorted by name, similarly like branches
are already sorted by name in tree views.
I have not run UI tests for this change, since local egit tests
generally tend to be red, even on origin/master.
Change-Id: I964f3dd04511837d43764ba6f1cf2be663e234e3
Signed-off-by: Michael Keppler <Michael.Keppler@gmx.de>