In NEO/go we changed the NEO URI scheme, so that client-only options
reside in the fragment part of the URI [1]. This means that we should
drop the complete fragment part within normalization in order to ensure
wendelin.core correctly recognizes two different URI pointing to the
same storage.

This hasn't been done in nexedi/wendelin.core!17, because
nexedi/neoppod!18 was still unresolved.

[1] kirr/neo@4c9414ea