With this change there will be only one supported credential per
VINO CR. Since the CR is mounted inside the sushy tools container,
sushy startup script can access these credentials and set up
authentication. This approach allows to get basic functionality
working, in the future, we would probably want to hide these
credentials in a secret so they can't be seen in plain text from
VINO CR.
Change-Id: I4aa2fb1ee1f5633b889acfa901283f5fa51ad2c1
eda3300093