Allow rlimit core to be set on the bots
Allow rlimit core to be set on the bots

rust-lang-deprecated/rust-buildbot,rust-lang/rust-buildbot,edunham/rust-buildbot,rust-lang-deprecated/rust-buildbot,edunham/rust-buildbot,rust-lang/rust-buildbot,rust-lang/rust-buildbot,aidanhs/rust-buildbot,edunham/rust-buildbot,rust-lang-deprecated/rust-buildbot,aidanhs/rust-buildbot,aidanhs/rust-buildbot