OVM/ovs-agent

Change ovs-agent Password
ovs-agent-passwd oracle # or ovs-agent-passwd oracle

References:
 * Changing the ovs-agent password on Oracle VM Server 3.0 (Oracle's Virtualization Blog) - https://blogs.oracle.com/virtualization/entry/changing_the_ovs_agent_password
 * 2.3. Changing the Oracle VM Agent Password - http://docs.oracle.com/cd/E26996_01/E18548/html/VMIUG-change-agent-password.html