Eyal 15aec9dc7e add pre_test_hook file
we need this option for some tempest tests

Depends-On: I310c0c711aba8eb1aecea6c06c0998f35d5bfc62
Change-Id: I60c2c05e94615f39b433621e540dd3b21886ac59
2019-01-16 13:57:05 +02:00
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