Suspended SIGINT handling while Docker Compose is running.
Suspended SIGINT handling while Docker Compose is running.

This commit suspends SIGINT handling while Docker Compose is running,
waiting instead until any Docker Compose process has exited before
terminating due to a SIGINT signal. This stops Docker Compose cleanup
output from flowing over the next command line prompt.

Signed-off-by: Jacob Howard <f862f167b85d41b225785c70d70808bc7337c1fe@havoc.io>

havoc-io/mutagen,havoc-io/mutagen