When this boolean parameter is set to true, updating a merge request
cancels any pending merge-request builds.
Change-Id: Ic5ef400cf4cd088680b92bd10b88b79520795729
also add tests for branch-filter-type on < 1.2.0 to make Zuul happy :(
Change-Id: Ia0aa807e1139bacc3e808b6bdc9680648b596275
Signed-off-by: Evgeni Golov <evgeni@golov.de>