In case some of you decide to deploy VMWare Virtual Data Protection Appliance and integrate it into vCenter Server or linux Appliance there’s very handy vSphere Data Protection Administration Guide located at:
http://pubs.vmware.com/vsphere-55/topic/com.vmware.ICbase/PDF/vmware-data-protection-administration-guide-551.pdf
but as I have discoverd it missing one quite important info: root password after installing vdp server:)
The password is

changeme

So after deployning an OVF template with VDP appliance browse to:
https://<IP_address_VDP_Appliance>:8543/vdp-configure/
enter above password and continue as describe in admin guide.
Hope this saves you time I have spent to figure it out:)