add a test to cover bound stepping in inventory
add a test to verify ansible detect invalid range
add test for missing end in host range
add test for incorrect format in range host
test that using non ordered range of char send a exception
add one last test, for combined range, which make ansible.inventory.expand_hosts
covered to 100%
Merge branch 'add_tests_inventory' of https://github.com/mscherer/ansible into mscherer-add_tests_inventory