Stop assuming that /usr/bin/python exists

[panos]

This proposed change will change all occasions of /usr/bin/python to the more agnostic /usr/bin/env python, similarly to the change here.

Relevant Trac ticket

[coveralls]

Pull Request Test Coverage Report for Build 7994

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 63.397%

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Totals
Change from base Build 7980:	0.02%
Covered Lines:	50010
Relevant Lines:	78884

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💛 - Coveralls

[panos]

I force-pushed a new commit, after the previous CI check failed, due to me using a # before the ticket number in the commit message.

EDIT: I forgot to make a similar change to the changelog, which also had the same issue.

[panos]

I tested and looked into more files in order to figure out which ones should use Python 2, which ones should use Python 3 and which ones should be considered as version agnostic.

[teor2345]

Thanks!

Let us know when you've got things working. You might find some of the changes in #1686 helpful.

[panos]

Thanks!

Let us know when you've got things working. You might find some of the changes in #1686 helpful.

The only problem that I can really think of right now is the tree thing/merge conflict.