** Description changed:

  SRU Justification (for Artful/Zesty/Xenial):
  
  Impact:
  "fanatic enable-fan" calls to fanctl to actually bring up the Fan bridge. 
However it is possible that this returns with an error and in that case fanatic 
must undo previously done configuration changes or otherwise any following 
attempt to run enable-fan will incorrectly believe the bridge is up and do 
nothing.
  
  Fix:
  Adding a remove config stage if the call to fanctl returns with an error.
  
  Testcase:
    [fan is installed but not enabled]
    - sudo flock -x /run/xtables.lock sleep 300
    - fanatic enable-fan -u 192.168.0.0/16 -o 250.0.0.0/8; echo $?
  
+ Note: It seems in Artful, the default for iptables is to wait until the
+ lock is released (without -w) so the test here won't work without adding
+ -w to all iptables calls in fanctl. :/
+ 
  Regression potential:
  Cleanup called only on failure and the used function is also used in fanatic 
disable-fan. -> Low

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https://bugs.launchpad.net/bugs/1728050

Title:
  fanatic enable-fan does not clean up config after failed bringup

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