Support linux namespace clone flags
Summary: This diffs adds supports on folly::Subprocess to be able to take clone flags and use them to call clone(2) instead of the default vfork() I checked that all tests pass when I replace vfork with fork on trunk. So there isn't anything built assuming the parent is paused for an execve. Correct me if I am wrong here. (Note: this ignores all push blocking failures!) Reviewed By: snarkmaster Differential Revision: D4853169 fbshipit-source-id: 7e5851df3a49996a4a5dc1945457686dd042e1f4
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