Append to clouddriver.log (#2155)
Append to clouddriver.log (#2155)

Append to clouddriver.log so that restarting clouddriver doesn't make the existing log lines disappear.
ajordens/clouddriver,duftler/clouddriver,ajordens/clouddriver,duftler/clouddriver,ajordens/clouddriver,duftler/clouddriver,spinnaker/clouddriver,spinnaker/clouddriver,ajordens/clouddriver,duftler/clouddriver,spinnaker/clouddriver