GCP Subscriber creation failure can hang Hindsight

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I setup a new test environment and when I ran my tests (grpc c++ client connecting to pub/sub) it tried to create a subscription to a topic that doesn't exist. The first request fails properly with a resource not found error but a subsequent request produces the following errors and then hangs the test. If the topic exists the test runs as expected.

$ hindsight hindsight.cfg 7
1532035590657538505 [info] hindsight starting
1532035590658559554 [info] input.prune starting
1532035590660249984 [info] input.testdata starting
1532035590840338912 [error] input.load Resource not found (resource=pub).
1532035590843012596 [error] input_plugins input.load lsb_heka_create_input failed
E0719 21:26:30.849535646    3108 security_connector.cc:993]  Could not get default pem root certs.
E0719 21:26:30.849570840    3108 secure_channel_create.cc:112] Failed to create secure subchannel for secure name 'pubsub.googleapis.com'
E0719 21:26:30.849576737    3108 secure_channel_create.cc:141] Failed to create subchannel arguments during subchannel creation.
E0719 21:26:30.849588408    3108 security_connector.cc:993]  Could not get default pem root certs.
E0719 21:26:30.849592126    3108 secure_channel_create.cc:112] Failed to create secure subchannel for secure name 'pubsub.googleapis.com'
E0719 21:26:30.849595958    3108 secure_channel_create.cc:141] Failed to create subchannel arguments during subchannel creation.
1532035617076565342 [info] input.testdata detaching received: 0 msg: 
^C1532035629066886805 [info] hindsight stop signal received

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The Google libraries in the CI system should be updated