ginkgomon.Interrupt and ginkgomon.Kill take an optional timeout
ginkgomon.Interrupt and ginkgomon.Kill take an optional timeout

Signed-off-by: Eric Malm <f38766f3ef0e8328064f8aa2a19c8805448432f2@pivotal.io>

jfmyers9/ifrit,lwoydziak/ifrit,tedsuo/ifrit,jenspinney/ifrit