Sorin Sbarnea b6311b5498 Switch prep-apply.sh to use python3
As part of py2 deprecation, we need to obliterate its use before
being able to drop it.

Change-Id: I35101a53265705513feaf7278e48c02a92a0c3e5
2020-06-15 14:43:25 -05:00
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