Please fix support of Red Hat Software Collection versions

[iakovgan]

Support of Red Hat Software Collection was broken with validation of python::version variable.

Error: Could not retrieve catalog from remote server: Error 400 on SERVER: validate_re(): "python27" does not match ["system", "pypy", "3"] at .... /modules/python/manifests/init.pp:98 on node [NODE]

This pull request fixes this issue.

[shivapoudel]

Fix the travis-ci builds ;)

[iakovgan]

I for me it is ok: is something else broken?

[root@vm puppet-python]# bundle exec metadata-json-lint metadata.json && bundle exec rake validate && bundle exec rake lint && SPEC_OPTS="--format documentation" bundle exec rake spec
...
Finished in 20.65 seconds (files took 2.65 seconds to load)
83 examples, 0 failures

BTW do not merge now. SCL support is broken much harder than i thought and was not tested for a long time. Working on a fix.

Please help me to pass travis my patch is inrelevant to the test.

[iakovgan]

I withdraw this PR. SLC support needs a bigger fix. #270 is a good candidate but will need an update of documentation and fix of python::pip .