Revert "tilecache: reject request without user-agent"
Revert "tilecache: reject request without user-agent"

This reverts commit 15f6c76154197f073ec926f6e4ad3ec5b8841899.

tomhughes/openstreetmap-chef,tomhughes/openstreetmap-chef,Firefishy/chef,tomhughes/openstreetmap-chef,Firefishy/chef,openstreetmap/chef,tomhughes/openstreetmap-chef,openstreetmap/chef,zerebubuth/openstreetmap-chef,zerebubuth/openstreetmap-chef,openstreetmap/chef,zerebubuth/openstreetmap-chef,Firefishy/chef,Firefishy/chef,openstreetmap/chef,Firefishy/chef,zerebubuth/openstreetmap-chef,zerebubuth/openstreetmap-chef,zerebubuth/openstreetmap-chef,openstreetmap/chef,tomhughes/openstreetmap-chef,openstreetmap/chef,openstreetmap/chef,tomhughes/openstreetmap-chef,Firefishy/chef,Firefishy/chef,Firefishy/chef,zerebubuth/openstreetmap-chef,tomhughes/openstreetmap-chef,tomhughes/openstreetmap-chef,zerebubuth/openstreetmap-chef,openstreetmap/chef