Ignore egg-info directory

After running tox, openstack.requirements.egg-info is created and
untracked by git.

Change-Id: I2b9311973116345bbb87a15480c12b9969cbb1ec
psutil >= 1.1.0 is actually on PyPI

It's insecure to use anything other than this and breaks the gate.

Additionally, 1.1.0 doesn't work - so exclude it from the version list.

Change-Id: Ie0a48f759abeef62b8c06b9954c7ccfc76f990be
Fix testtools version and bump subunit to >=0.0.18

The problem of incompatibility between subunit<0.0.18 and
testtools>=0.9.35 was fixed in subunit>=0.0.18:
https://launchpad.net/subunit/trunk/0.0.18

Additionally, subunit is now depends on testtools>=0.9.34

Change-Id: Iad31fa3772dbb904cb2f71934a8a93d2ef18fc3d
Merge "Fix testtools version and bump subunit to >=0.0.18"
Merge "Ignore egg-info directory"
Merge "psutil >= 1.1.0 is actually on PyPI"