Bump layer-ols-http to r9 (#523)
Bump layer-ols-http to r9 (#523)

The only effective difference here is to remove invalid characters from
the Nagios service description.  For the full diff, see:

  https://bazaar.launchpad.net/~ubuntuone-pqm-team/ols-charm-deps/layer-ols-http/revision/9?compare_revid=3

I'm avoiding newer revisions for the time being since those will require
either a code change (to implement `/_status/check`) or a Mojo spec
change (to suppress the `httpchk` option).
canonical-ols/build.snapcraft.io,canonical-websites/build.snapcraft.io,canonical-websites/build.snapcraft.io,canonical-ols/build.snapcraft.io,canonical-ols/build.snapcraft.io,canonical-websites/build.snapcraft.io