deploy: adding OVIRT_NODE env constant
deploy: adding OVIRT_NODE env constant

Add OVIRT_NODE environment constant.

Change-Id: I0bd6e55d5dfa1eac65217a09ab6c657321e7cb1a
Signed-off-by: emesika <dc8a2a200abf66067593de2e51fee9376f06ea0f@redhat.com>

oVirt/ovirt-host-deploy,oVirt/ovirt-host-deploy,oVirt/ovirt-host-deploy