Honeycomb interface state management test

Honeycomb interface state management test

 - add simple test for interface management through Honeycomb API
 - add status code 500 to honeycomb startup check whitelist,
   due to Honeycomb changes in https://gerrit.fd.io/r/772
 - increase timeout value for Honeycomb startup check
 - modify Honeycomb setup keywords to allow starting Honeycomb
   on individual nodes
 - remove sanity test suite, tests now sorted by functional areas
   such as interfaces, bridge domains, VXlan,...

Change-Id: I87f9cf69577706f3b00e24a8d2c01df52fc707c6
Signed-off-by: selias <samuel.elias@pantheon.tech>