Bug Report: VTCombo does not create VSchema in topo

[brendar]

Overview of the Issue

After starting a keyspace with vtcombo/vttestserver I would expect to be able to get the VSchema for that keyspace, but attempting to do so will result in a node doesn't exist error.

Reproduction Steps

Terminal 1

vttestserver --keyspaces "foo" --num_shards 1

Terminal 2:

vtctldclient --server 127.0.0.1:11151 GetVSchema foo
E0610 13:30:19.281856   86894 main.go:56] rpc error: code = Unknown desc = node doesn't exist: keyspaces/foo/VSchema

Binary Version

Impacts main and previous releases

Operating System and Environment details

n/a

Log Fragments

No response