pip upgrade needs root

[jimux]

Steps to reproduce the error

I checked out the source tree and ran
vagrant up --provision

Actual behavior

The VM build failed at step "Upgrade to latest PIP version":
Installing collected packages: pip
Found existing installation: pip 1.5.4
Not uninstalling pip at /usr/lib/python2.7/dist-packages, owned by OS
Can't roll back pip; was not uninstalled

Expected behavior

"changed: [default]"

Resolution

Rather than running as the app_user, vagrant, the update needs to be done as root.
become_user: "root"

[ian-ross]

I think this is a duplicate of #900

[jimux]

My mistake. I was only searching open issues when I checked. pip install ansible==2.1.2.0 fixed it right up. Perhaps a note to that effect could be added to the README. Ansible 2.2 was also resulting in the "Install requirements" step looking for Python.h in the wrong place.

[ian-ross]

Yeah, there's a bad bug in the pip module in Ansible 2.2 that more or less completely breaks conventional use of Python virtual environments. There's an issue open for it so I hope it'll be fixed in the next Ansible release.

[dpalomino]

Not relevant now, closing it.