snap-store-proxy: can't list all set overrides

[Kyle Nitzsche]

There seems to be no command to list all overrides set on a snap-store-proxy. You need to provide the name of the snap to find out if there are overrides set for it. The problem with this is that if you don't already know, you can't find out.

root@snap-store-proxy-2:~# snap list snap-store-proxy
Name Version Rev Tracking Publisher Notes
snap-store-proxy 2.14 78 latest/stable canonical✓ -

root@snap-store-proxy-2:~# snap-proxy list-overrides
usage: snap-proxy list-overrides [-h] [--series SERIES] snap_name
snap-proxy list-overrides: error: the following arguments are required: snap_name
root@snap-store-proxy-2:~# snap-proxy list-overrides --series 16
usage: snap-proxy list-overrides [-h] [--series SERIES] snap_name
snap-proxy list-overrides: error: the following arguments are required: snap_name