Coerce loglevel facet to int when updating

Coerce loglevel facet to int when updating

Calling the set command always results in updating values to type
str, which can result in failures when those values are later
re-read. Explicitly coerce the loglevel value to int whenever it is
updated to avoid a subsequent exception when calling the show log
command.

This points out a need for maintaining a schema so that values can
be coerced to the appropriate type when needed, but for now the
conditional adjustment can serve as a placeholder for a more
thorough design.