Merge remote-tracking branch 'tor-github/pr/1039' into maint-0.3.5

changes/ticket30454

src/feature/hs/hs_cell.c

src/feature/hs/hs_cell.h

src/feature/hs/hs_client.c

src/feature/hs/hs_intropoint.c

src/feature/hs/hs_intropoint.h

src/test/test_hs_cell.c

src/test/test_hs_intropoint.c

src/trunnel/hs/cell_introduce1.c

src/trunnel/hs/cell_introduce1.h

src/trunnel/hs/cell_introduce1.trunnel