remove restriction on renaming a running container
remove restriction on renaming a running container

This is fine from a LXD point of view. The spec promises that we'll change the
hostname, but we currently don't do that for non-running containers, so there's
no reason to prevent this with running containers.

We might consider removing the hostname promise all together, since it seems a
little invasive.

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>

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