[web] use a redirect for /data/foo requests that don't use the instance md5 hash
The actual file contents can be cached for a long time. If the request
doesn't use the hash, that's wrong. Using a redirect lets keep the
caching for the actual file contents while not breaking requests missing
the hash.
addressbook
basket
blog
book
calendar
comment
company
email
file
folder
i18ncontent
keyword
link
mailinglist
person
tag
timeseries
vcsfile