Test scripts extending the image in OpenShift

[hhorak]

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For example the "extend-image" example can be tested like this:

 oc new-app mysql:5.7~https://github.com/sclorg/mysql-container.git \
   --context-dir=examples/extend-image \
   --name my-mysql-rhel7d \
   MYSQL_OPERATIONS_USER=opuser \
   MYSQL_OPERATIONS_PASSWORD=oppass \
   MYSQL_DATABASE=opdb \
   MYSQL_USER=user \
   MYSQL_PASSWORD=pass

After this, connecting using opuser:oppass should work.