[OWL-291] use short hostname
[OWL-291] use short hostname

Cepave/agent,masato25/open-falcon-backend,Cepave/open-falcon-backend,minimum-hsu/agent,donh/agent,minimum-hsu/agent,Cepave/agent,masato25/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,minimum-hsu/agent,donh/agent,Cepave/open-falcon-backend,Cepave/agent,Cepave/open-falcon-backend,donh/agent,masato25/open-falcon-backend,minimum-hsu/agent,donh/agent,Cepave/open-falcon-backend,Cepave/agent