Merge branch 'tb/ls-refs-optim'

The ls-refs protocol operation has been optimized to narrow the sub-hierarchy of refs/ it walks to produce response. * tb/ls-refs-optim: ls-refs.c: traverse prefixes of disjoint "ref-prefix" sets ls-refs.c: initialize 'prefixes' before using it refs: expose 'for_each_fullref_in_prefixes'