Merge #10555: [tests] various improvements to zmq_test.py
0a4912e [tests] timeout integration tests on travis after 20 minutes (John Newbery)
7c51e9f [tests] destroy zmq context in zmq_tests.py (John Newbery)
b1bac1c [tests] in zmq test, timeout if message not received (John Newbery)
5ebd5f9 [tests] tidy up zmq_test.py (John Newbery)
4a0c08f [tests] update zmq test to use correct config.ini file (John Newbery)
Tree-SHA512: 5e607af2f2dc5c73fba4b2d3890097580a7525f6a4996c7c78f01822e45e0054fd0a225ea53fce6308804e560cced6de6cf5d16137469dcf100b2e9643e08d03