Change-Id: Ieb82235bd6b436b6716992c1b45698b083d03d86
remove pre-existing chef files before uploading new chef files.
having legacy stale chef roles/cookbooks/databags in the knife
source directory will result in possible failure of dependency check,
so gurantee we have the latest code in that directory.
clean installation logs when refresh database.
Change-Id: I6609e90e51d8ca3560f1848f2de62e148f0c5b49
c4674360ef