Convert pthread_setname_np to folly::setThreadName
Convert pthread_setname_np to folly::setThreadName

Test Plan: Unit Test & build

Reviewers: dcapel, has, jacobl, kolmike, adek

Reviewed By: adek

Subscribers: chaoyc, search-fbcode-diffs@, net-systems@, zeus-diffs@, dhruba, jcoens, unicorn-diffs@, ldbrandy, apollo-diffs@, logdevice-diffs@, lins, yzhan, cgrigoruta, adek

Differential Revision: https://phabricator.fb.com/D2188514

Signature: t1:2188514:1435266156:7d6dcacee749fd5c0f4303977a283b4faa40a16b

linearregression/squangle