docs(OWNERS): add emeritus section (#3667)
docs(OWNERS): add emeritus section (#3667)

Cleaned up the owners file, adding the emeritus section and removing
an account that was not a core maintainer.
michelleN/deployment-manager,adamreese/deployment-manager,michelleN/deployment-manager,fibonacci1729/helm,technosophos/deployment-manager,appscode/helm,helm/helm,technosophos/k8s-helm,technosophos/k8s-helm,adamreese/helm,technosophos/deployment-manager,SlickNik/helm,michelleN/deployment-manager,bacongobbler/helm,adamreese/helm,eicnix/helm,adamreese/deployment-manager,eicnix/helm,helm/helm,jascott1/helm,technosophos/deployment-manager,SlickNik/helm,adamreese/deployment-manager,technosophos/deployment-manager,technosophos/deployment-manager,fibonacci1729/helm,adamreese/deployment-manager,appscode/helm,bacongobbler/helm,adamreese/deployment-manager,michelleN/deployment-manager,jascott1/helm