Fix-ups for I09926c8c2

* In xenon-generate-svgs: don't nullglob; set mindwidth to 0.5.
* Fix Apache URL rewrites; add mod_proxy_http on fluorine.
* Run xenon-log service as xenon rather than www-data.
* Pass redis config to redis client via '**'

Change-Id: I8170134759818d2583046c4edc89d3885c03eb25