Forbid overlapping primary and secondary rid ranges
    
    Commands ipa idrange-add / idrange-mod no longer allows the user
    to enter primary or secondary rid range such that has non-zero
    intersection with primary or secondary rid range of another
    existing id range, as this could cause collision.
    
    Unit tests added to test_range_plugin.py
    
    https://fedorahosted.org/freeipa/ticket/3086