Remove resource collector overriding pip_provider

[jplindquist]

Pull Request (PR) description

Remove resource collector overriding pip_provider parameter in Python::Pip

This Pull Request (PR) fixes the following issues

Fixes #505

There seems to be an unrelated acceptance test failing locally for me (it's failing on master as well):

Failures:

  1) python class default parameters works with ensure=>latest for package with underscore in its name
     Failure/Error: apply_manifest(pp, catch_failures: true)
     Beaker::Host::CommandFailure:
       Host 'debian9-64-1' exited with 6 running:
        puppet apply --verbose --detailed-exitcodes /tmp/apply_manifest.pp.si5Ebi
       Last 10 lines of output were:
       	Info: Applying configuration version '1571415656'
       	Notice: /Stage[main]/Main/Python::Virtualenv[venv]/File[/opt/venv4]/ensure: created
       	Notice: /Stage[main]/Main/Python::Virtualenv[venv]/Exec[python_virtualenv_/opt/venv4]/returns: executed successfully
       	Notice: /Stage[main]/Main/Python::Pip[Randomized_Requests]/Exec[pip_install_Randomized_Requests]/returns: DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
       	Notice: /Stage[main]/Main/Python::Pip[Randomized_Requests]/Exec[pip_install_Randomized_Requests]/returns: ERROR: Could not find a version that satisfies the requirement Randomized_Requests (from versions: none)
       	Notice: /Stage[main]/Main/Python::Pip[Randomized_Requests]/Exec[pip_install_Randomized_Requests]/returns: ERROR: No matching distribution found for Randomized_Requests
       	Error: '/opt/venv4/bin/pip --log /opt/venv4/pip.log install --upgrade     Randomized_Requests' returned 1 instead of one of [0]
       	Error: /Stage[main]/Main/Python::Pip[Randomized_Requests]/Exec[pip_install_Randomized_Requests]/returns: change from 'notrun' to ['0'] failed: '/opt/venv4/bin/pip --log /opt/venv4/pip.log install --upgrade     Randomized_Requests' returned 1 instead of one of [0]
       	Info: Class[Main]: Unscheduling all events on Class[Main]
       	Notice: Applied catalog in 4.40 seconds

[saz]

What's required to get this merged?

[igalic]

@saz somebody to review this code and approve of it.
Somebody (else) to figure out why acceptance tests are failing on 'debian9-64-1'… though this is lower priority, and not a blocker.
Does it maybe not have python2.7?

[saz]

The suggested change is working for me with pip 18.1 and 20.0.2.
Before this change, package installations where broken on pip 18.1

Tests are failing due to the deprecation of Python 2

[jplindquist]

Is there anything I need to do as well to help move this along?

[bastelfreak]

@jplindquist I fixed the test on master and rebased your branch.