BZ 788117 - Don't set session[:return_to] in UserSessions#new
BZ 788117 - Don't set session[:return_to] in UserSessions#new

This is already set up by require_user, so this was redundant.
Additionally, there was a bug where if you logged out, you were sent to /login
which would set return_to to request.request_uri... which was /login.

Resolves https://bugzilla.redhat.com/show_bug.cgi?id=788117

aeolusproject/conductor,aeolusproject/conductor,aeolusproject/conductor,aeolusproject/conductor