Set hostname as engine_id
Set hostname as engine_id

The engine_id used uuid will change every time when bilean-engine
rebooting, it made enine can not load related jobs from db. This
patch sets bilean-engine's hostname as engine_id.

Change-Id: I2ae41bd3ec0924febf6a13efbd90fcccf9710d25

openstack/bilean,openstack/bilean