Added OAuth2 authentication to apply_issue
Added oauth2client and httplib to third_party
BUG=348233
Review URL: https://codereview.chromium.org/183793010
git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@259643 0039d316-1c4b-4281-b951-d872f2087c98
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