Update git submodules
* Update barbican from branch 'master' - Merge "Use assertRegex instead of assertRegexpMatches" - Use assertRegex instead of assertRegexpMatches In Python3, assertRegexpMatches & assertNotRegexpMatches are deprecated in favor of assertRegex and assertNotRegex Change-Id: I5966bf52b86e3b7ce7fb0f75c662af15a50c122e
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