Remove the coroutine.py file because unused codes. Change-Id: I095ecd652c8ab17323ad330acb9bf4eddd790336
1. move skyline_apiserver out of libs 2. remove libs folder 3. remove old skyline folder 4. adjust zull, devstack and dockerfile Change-Id: I27a4babd3df077d1dfc7555f67a6ea618d4b2966