Prevent slugify username from social sso backends
Prevent slugify username from social sso backends

Relates #7684 of ansible-tower.

Slugify username in python-social-auth means disallowing
any non-alphanumerial characters, which is an over-kill
for awx/tower, thus disabling it.

Signed-off-by: Aaron Tan <555f4d7ad24fb44b9d01fe2d4954b2d18e7bdbd4@gmail.com>

wwitzel3/awx,wwitzel3/awx,wwitzel3/awx,wwitzel3/awx