Fix URL collission.
Improve scenario description.
Fix os_migrate_demo_assign_node_to_term().
Improve another test.
Improve path collision detetction.
Beeter use API to check alias collision.
Remove space.
Merge pull request #1822 from openscholar/1048-url-collision

Fix URL collision on taxonomy page term filter
This looks good, quick test worked.  Merging.  @sagotsky can you test again on dev?