zone_test: add recursive extend test

1 job for recursive_extend_test in 25 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #5737
run_tests

00:00:25

 
Name Stage Failure
failed
run_tests Test
TOTAL                    209     18    91%
----------------------------------------------------------------------
Ran 9 tests in 0.165s

FAILED (failures=1)
ERROR: InvocationError: '/builds/ale/zonetool/.tox/py27/bin/nosetests --with-coverage --cover-package=zonetool --cover-erase'
___________________________________ summary ____________________________________
ERROR: py27: commands failed
ERROR: Job failed: exit code 1