Deprecate Python2.6 by using Python3 on CentOS/RHEL 6 (#5329)

* If there's no python or there's only python2.6 on red hat systems, install python3

* Always check for python2.6

* address style, documentation, nits

* factor out all initialization code

* fix up python version return value when no python installed

* add no python error and exit

* document DeterminePythonVersion parameters

* build letsencrypt-auto

* close brace

* build leauto

* fix syntax errors

* set USE_PYTHON_3 for all cases

* rip out NOCRASH

* replace NOCRASH, update LE_PYTHON set logic

* use built-in venv for py3

* switch to LE_PYTHON not affecting bootstrap selection and not overwriting LE_PYTHON

* python3ify fetch.py

* get fetch.py working with python2 and 3

* don't verify server certificates in fetch.py HttpsGetter

* Use SSLContext and an environment variable so that our tests continue to never verify server certificates.

* typo

* build

* remove commented out code

* address review comments

* add documentation for YES_FLAG and QUIET_FLAG

* Add tests to centos6 Dockerfile to make sure we install python3 if and only if appropriate to do so.

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