Fix temporary build failure due to bug in 'kitchen-ansible'

[arm4b]

Temporary workaround to pin kitchen-ansible version, since recent 0.46.1 neillturner/kitchen-ansible#226 (comment) broke second run of Ansible to test for idempotence.

Build error: https://travis-ci.org/StackStorm/ansible-st2/jobs/210297604

       bash: -c: line 3: syntax error near unexpected token `&&'
       bash: -c: line 3: ` && (echo 'Going to invoke ansible-playbook second time:';           '
>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ActionFailed
>>>>>> Message: 1 actions failed.

TODO: Revert when the bug is fixed in upstream https://github.com/neillturner/kitchen-ansible/releases

[lakshmi-kannan]

hahaha