Merge branch 'tc/bundle-uri-empty-fix'

The client-side parser of the server-advertised bundle-URI list has
been updated to drain the remaining response in order to avoid
protocol desynchronization when the server sends a misconfigured list.
Also, the server-side has been taught to omit empty configuration
values instead of sending invalid key-value lines.

* tc/bundle-uri-empty-fix:
  bundle-uri: stop sending invalid bundle configuration
  bundle-uri: drain remaining response on invalid bundle-uri lines

diff --cc bundle-uri.c
Simple merge

diff --cc t/lib-bundle-uri-protocol.sh
Simple merge

diff --cc t/t5558-clone-bundle-uri.sh
Simple merge