config: Try to be clever about ":" in snapshots
config: Try to be clever about ":" in snapshots

If we detect a ":" in the provided string and can't find any remote with
that name and we detect a "/" in the resource name, then assume we're
dealing with a snapshot containing ":" and select the default remote.

Launchpad: https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/1694855
Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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