Bump kubernetes plugin version to v0.6.0
Bump kubernetes plugin version to v0.6.0

projectcalico/calico-containers,TrimBiggs/calico-containers,tomdee/calico-docker,projectcalico/calico-docker,tomdee/calico-containers,caseydavenport/calico-containers,insequent/calico-docker,caseydavenport/calico-docker,TrimBiggs/calico-containers,TrimBiggs/calico-docker,tomdee/calico-docker,alexhersh/calico-docker,TrimBiggs/calico-docker,caseydavenport/calico-containers,alexhersh/calico-docker,caseydavenport/calico-containers,tomdee/calico-containers,insequent/calico-docker,quater/calico-containers,projectcalico/calico-docker,projectcalico/calico-containers,projectcalico/calico-containers,Metaswitch/calico-docker,Metaswitch/calico-docker,quater/calico-containers,caseydavenport/calico-docker