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Fixes #7007 Python 3.4 is [EOL](https://www.python.org/dev/peps/pep-0429/), and only Python 3.x version available for CentOS 6 through EPEL is this version, and so is used by `certbot-auto`, the only official way to install Certbot on this platform. This unpleasant situation becomes a little more uncomfortable, considering that the newest `pip` version (19.2) [just dropped Python 3.4 support](https://github.com/pypa/pip/issues/6685) and will refuse to start on this Python version. We can expect a lot of dependencies to follow this path now. One direct result of this situation is that a fix to support correctly the ARM platforms requires to upgrade `pip` to 19.2 for `certbot-auto`. So this is not possible right now. Then, let's upgrade Certbot instances on CentOS 6 to a supported version of Python 3. This PR proposes a new bootstrap approach for CentOS 6 platform, `BootstrapRpmPython3Legacy`, that will install Python 3.6 from [SCL](https://www.softwarecollections.org) (the latest one available for now on CentOS 6). In term of Python 3 specific bootstrap methods, I take the occasion here to completely separate the bootstrap of CentOS 6 as a legacy system, from the RPM-based newest systems (like Fedora 29+) that are simply dropping support for Python 2.x. This is in prevision of future migration for all systems on Python 3.x, that is a different problematic than supporting old systems. * Add logic * Rebuilt letsencrypt-auto * Fix logic * Focus on specific packages * Maintain PATH for further invocations of letsencrypt-auto after bootstrap. * Various corrections * Fix farm test for RHEL6 * Working centos6 letsencrypt-auto self tests * Fix test_sdist for CentOS 6 * Corrections * Work in progress * Working configuration * Fix typo * Remove EPEL. Add a test. * Update letsencrypt-auto-source/letsencrypt-auto.template Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Improvements after review * Improvements * Add a comment * Add a test * Update a test * Corrections * Update function return * Work in progress * Correct behavior on oracle linux 6. * Corrections * Rebuild script * Add letsencrypt-auto tests for oraclelinux6 * Update tox.ini Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/letsencrypt-auto Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/tests/oraclelinux6_tests.sh Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/letsencrypt-auto.template Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/letsencrypt-auto Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/letsencrypt-auto Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/letsencrypt-auto.template Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/tests/oraclelinux6_tests.sh Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Remove specific code for scientific linux * Change some variables names * Update letsencrypt-auto-source/tests/oraclelinux6_tests.sh Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Various corrections * Fix tests * Add a comment * Update message * Fix test message * Update letsencrypt-auto-source/letsencrypt-auto.template Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/letsencrypt-auto Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/letsencrypt-auto Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update scripts * More focused assertion * Add back a test * Update script * Update letsencrypt-auto-source/letsencrypt-auto.template Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Update letsencrypt-auto-source/letsencrypt-auto.template Co-Authored-By: Brad Warren <bmw@users.noreply.github.com> * Check quiet mode * Add changelog * Update letsencrypt-auto-source/tests/oraclelinux6_tests.sh Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>