fix failing acceptance test and remove suppression sol11

(cherry picked from commit 342d898615ba20cfb0cc9f480529e5a2527b6d24)
Enable Ctrl-C to kill all sub processes on Windows.

...not just the test script itself. This will even kill stuck
processes such as cf-agent or cf-serverd. It does *not* work by
terminating the SSH connection yet though.

(cherry picked from commit d90a687598cd43c62d405ccacf0fe14a7fab8301)