Re-use 'lookup_revision_id' function from Vcs.
Re-use 'lookup_revision_id' function from Vcs.

rjust/defects4j,rjust/defects4j,jose/defects4j,jose/defects4j,jose/defects4j,jose/defects4j,rjust/defects4j,rjust/defects4j