topic: add the changelog argument to branchinfo() 47c03042cd1d in core added a changelog argument to revbranchcache.branchinfo() and we wrap that function in topic extension. So let's add this optional argument in topic extension too.

. $TESTDIR/testlib/common.sh

cat >> $HGRCPATH <<EOF
[ui]
interactive = true
[phases]
publish=False
[extensions]
evolve =
[experimental]
evolution.effect-flags = yes
EOF

sync() {
   hg pull -R $TESTTMP/server . -q
}