Speculative bump of gRPC to 1.2.1 to test for hangs

[smarterclayton]

https://bugzilla.redhat.com/show_bug.cgi?id=1521169 may require an update to gRPC. Test building a newer version.

[openshift-ci-robot]

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This pull-request has been approved by: smarterclayton

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[openshift-ci-robot]

@smarterclayton: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/cmd	29f5e02	link	/test cmd
ci/openshift-jenkins/verify	29f5e02	link	/test verify
ci/openshift-jenkins/unit	29f5e02	link	/test unit
ci/openshift-jenkins/integration	29f5e02	link	/test integration
ci/openshift-jenkins/extended_conformance_gce	29f5e02	link	/test extended_conformance_gce
ci/openshift-jenkins/end_to_end	29f5e02	link	/test end_to_end
ci/openshift-jenkins/extended_networking_minimal	29f5e02	link	/test extended_networking_minimal
ci/openshift-jenkins/extended_conformance_install	29f5e02	link	/test extended_conformance_install

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[stevekuznetsov]

/unassign