Specify min pip version

[Kami]

This fixes regression introduced by #318.

We only specified a max version and not a min one which means any pip version prior 8.0.0 would satisfy that requirement.

This means that on the systems which ship old pip versions things would break since pip < 6.1 doesn't include all the functionality we need.

Caught by @dzimine.

[Kami]

Merged into test-v1.3.0 branch for testing.

[Kami]

Looks like there is something more going on.

root@server-01:~# pip -V
pip 7.1.2 from /usr/local/lib/python2.7/dist-packages (python 2.7)
root@server-01:~# /opt/stackstorm/virtualenvs/st2/bin/pip -V
pip 1.5.4 from /opt/stackstorm/virtualenvs/st2/local/lib/python2.7/site-packages (python 2.7)

It looks like for some reason pip version in virtualenv is really old.

[Kami]

root@server-02:~# pip -V
pip 7.1.2 from /usr/local/lib/python2.7/dist-packages (python 2.7)
root@server-02:~# virtualenv -p /usr/bin/python v3
Already using interpreter /usr/bin/python
New python executable in v3/bin/python
Installing setuptools, pip...done.     
root@server-02:~# v3/bin/pip -V
pip 1.5.4 from /root/v3/local/lib/python2.7/site-packages (python 2.7)
root@server-02:~# virtualenv --version
1.11.4

The root cause seems to be using very old virtualenv which uses old pip version by default. I'm still baffled how this worked in the past.

[Kami]

I want to test those changes (https://github.com/StackStorm/st2/pull/2420) from st2 as well, notably the requirements.txt change, so I'm using a little "trick".

curl -L -o install.sh https://install.stackstorm.com
DEBUG=1 bash install.sh -a answers.yaml

answers.yaml contains:

st2::version: 1.3dev
st2::revision: 94

The reason for using dev version is to force puppet-st2 to use requirements.txt from master and not from a tag - https://github.com/StackStorm/puppet-st2/blob/master/manifests/profile/server.pp#L81

[Kami]

I'm going to merge this since it doesn't break anything, but it's not a full fix for the virtualenv issue.

Full fix for the virtualenv issue is to be discussed on.