Detect and ignore bogus KeyboardInterrupts raised by PyZMQ

PyZMQ==13.0.0 raises EINTRs as KeyboardInterrupt exceptions for some infernal
reason. See <https://github.com/zeromq/pyzmq/pull/338>.

Change-Id: Ia6b1282d46ab8e61ddb0e116eb154ba95e230288
Merge "Detect and ignore bogus KeyboardInterrupts raised by PyZMQ"