Add BASE_IMAGE parameter to s2i-python

[sveno1990]

Changes

Added a parameter to change the default base image for s2i-python

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[jkandasa]

@sveno1990 thanks for the PR, can you please update the default as image-registry.openshift-image-registry.svc:5000/openshift/python ?

and the default should be a string not array []

[sveno1990]

Thanks @jkandasa, my bad, issue should now be fixed.

[pratap0007]

/ok-to-test

[sveno1990]

Added the remaining s2i tasks in the PR below:
#2401