python-pip requires EPEL on Redhat/CentOs 6 and 7

[gene1wood]

First, apologies for opening this issue. There's an existing issue #115 which begins to describe this bug. I'm opening this issue because conversation on #115 has been restricted to contributors by @shivapoudel (which is of course totally fine).

@shivapoudel would it be possible to add a comment to that issue to indicate the status of any efforts to fix that bug or what people should do who use RHEL/CentOS? From the comments in that issue I wasn't able to determine why the conversation had been restricted (there may be background to this issue I'm unaware of).

To clarify the problem (which isn't very specific in #115), under RHEL/CentOS 7, attempting to install python-pip with a stanza like this

  class { 'python' :
    pip => true,
  }

will fail because the system package that this puppet module calls for isn't part of the base RHEL/CentOS packages, but instead part of EPEL.

A solution to this problem (which I'll try to PR) would be to include the stahnma-epel puppet module as a dependency in the metadata.json. The nice thing about the stahnma-epel puppet module is that it only takes effect on RHEL derivatives and does nothing on other operating systems.

[gene1wood]

Some details about this

Package	OS	Source
python-pip	RHEL/CentOS 6	EPEL
python-virtualenv	RHEL/CentOS 6	EPEL
python-pip	RHEL/CentOS 7	EPEL
python-virtualenv	RHEL/CentOS 7	base

[shivapoudel]

@gene1wood You can submit the PR for this :)