role/swift: fix a typo

Fix err: Could not retrieve catalog from remote server: Error 400 on
SERVER: Duplicate parameter 'ensure' for on
File[/usr/local/bin/swift-ganglia-report-global-stats] at
/etc/puppet/manifests/role/swift.pp:78 on node ms-fe1001.eqiad.wmnet

While at it, order the parameters in the rest of the file and get rid of
semicolons.

Change-Id: If37c0d12f09baaf5ab547fe0af41c56a8d77fd39