Return the SG rule created in create_security_group_rule() method

On creating a SG rule, we were not returning the SG rule dict.
Corrected it now
Import changes in lbaas to handle recent code refactoring
Return the right floatingips in create_floatingips()

Earlier we were returning all the fips in the tenant in create_floatingips()
method.
Now, return only list of fips created in create_floatingips() and handle
the same in delete_floatingips()
Run serial/parallel tests with their own PYTHONPATH