Update dci-dbprovisioning to use python3
Update dci-dbprovisioning to use python3

Python2 is no longer available in the api image.
Updated the script to work with Python3.

Change-Id: I5cdf390423ee1e4e5bcfbd28b4f2c590c20a0ca5

redhat-cip/dci-control-server,redhat-cip/dci-control-server