tools/oxenstored: Log live update issues at warning level

tools/oxenstored: Log live update issues at warning level

During live update, oxenstored tries a best effort approach to recover as many
domains and information as possible even if it encounters errors restoring
some domains.

However, logging about misunderstood input is more severe than simply info.
Log it at warning instead.

Signed-off-by: Edwin Török <edvin.torok@citrix.com>
Acked-by: Christian Lindig <christian.lindig@citrix.com>
(cherry picked from commit 3f02e0a70fe9f8143454b742563433958d4a87f8)