Radosław Piliszek af7305f2aa Fail kolla-ansible early when not available in the PYTHONPATH
Starting with the Train release, kolla_ansible (the package) must be
available in the PYTHONPATH to run most playbooks.
It is documented.
This change makes the error message friendlier.

Change-Id: Icf0399d21b3fde8d530d73e6e7ee4a57665da276
Closes-bug: #1849943
2019-10-26 15:09:15 +02:00
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