Fix 'olso' typo in lib/oslo

This enables commit If92073be5a431840701c952a194e63a7c452c9ca
for cleaning up potentially installed older oslo.config. Here are
its original details.

If the user had oslo.config installed prior to us setting up the
oslo.config out of git they can get themselves into this very funny
situation where pip doesn't see oslo.config 1.1.x, however some
packages might. This manifests itself as a user error trying to
start nova-api which uses DeprecatedOption, not in oslo.config 1.1.x

Because of the funny state pip is in, you can't uninstall oslo.config.

So in these situations, if we see old oslo.config in the filesystem,
pip install / uninstall it to ensure that everyone ends up using the
git version instead.

To reduce the amount of user confusion, do this on every
install_oslo for a while, which we can purge after Havana ships.

Change-Id: I7fa0b70497bf5622f4638da284afe5363a004d3c
Fixes: bug #1213089