vr: defer was broken in VR because of json name change

Committed at f0491d5 (#2979).

After upgrade from CS 4.10 to CS 4.11, multiple VRs did not start through.
It did not properly defer the finalize config in update_config.py.
Apparently, the json files are now called differently: where it used to
be vm_dhcp_entry.json it now has a uuid added, for example
vm_metadata.json.4d727b6e-2b48-49df-81c3-b8532f3d6745.
The if statement that checks if the finalize can be safely deferred
therefore no longer matches. This PR contains a fix so finalize is
defered again.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Author: Rene Diepstraten