Merge branch 'jk/HEAD-symref-in-xfer-namespaces' into maint

The server side support for "git fetch" used to show incorrect
value for the HEAD symbolic ref when the namespace feature is in
use, which has been corrected.

* jk/HEAD-symref-in-xfer-namespaces:
upload-pack: strip namespace from symref data

diff --cc upload-pack.c
Simple merge