Add CaptureFD for log testing (and some glog patterns)
Summary: Without a gadget like this, it's really hard to test logging output. With it, it's really easy. I found about 50 callsites to the various functions across several projects, so folly seems appropriate. PS The patterns are functions for two reasons: - Static variables are a pain. - This leaves the option of adding an optional argument, so you can grep for a particular kind of error string. Test Plan: unit test Reviewed By: yfeldblum@fb.com Subscribers: folly-diffs@, yfeldblum FB internal diff: D1933439 Signature: t1:1933439:1427345479:5b3d1c6566a026fdbccb16b382211688e327ea1a
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