fixed missing sorting in test-dumprevlog

The test failed at random because the order of files was non-deterministic,
which produced diffs in test output.

tests/test-dumprevlog

@@ -23,7 +23,7 b' python $CONTRIBDIR/dumprevlog .hg/store/'
 echo dumprevlog done
 
 # dump all revlogs to file repo.dump
-find .hg/store -name "*.i" | xargs python $CONTRIBDIR/dumprevlog > ../repo.dump
+find .hg/store -name "*.i" | sort | xargs python $CONTRIBDIR/dumprevlog > ../repo.dump
 
 cd ..