HIVE-2400: fix obsolete python references

[celebdor]

New builder images do not alias python to python3

[openshift-ci-robot]

@celebdor: This pull request references HIVE-2400 which is a valid jira issue.

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In response to this:

New builder images do not alias python to python3

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[lleshchi]

/lgtm

[2uasimojo]

[efried@efried hive]$ git grepv python
Makefile:SOURCE_GIT_TAG := $(shell export HOME=$(HOME); python3 -mpip install --user gitpython >&2; hack/version2.py)
docs/using-hive.md:      deploy_kernel_url: "http://172.22.0.3:6180/images/ironic-python-agent.kernel"
docs/using-hive.md:      deploy_ramdisk_url: "http://172.22.0.3:6180/images/ironic-python-agent.initramfs"
hack/app-sre/generate-saas-template.py:#!/usr/bin/env python
hack/bundle-gen.py:#!/usr/bin/env python
hack/statuspatch:python -c "import os, socket as s; s.socket(s.AF_UNIX).bind('$socket')"
hack/version2.py:#!/usr/bin/env python3

/lgtm

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 23249e8 and 2 for PR HEAD 2ee6d59 in total

[2uasimojo]

Nice.

/lgtm

[2uasimojo]

/lgtm

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 23249e8 and 2 for PR HEAD e1707c4 in total

[2uasimojo]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 2uasimojo, celebdor, lleshchi

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[openshift-ci]

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