qfinish: comply with the phases.new-commit option in secret mode (issue3335) In secret mode qfinished changeset were move to the draft phase in all case[1] without regard to phases.new-commit value This changeset ensure qfinish does not automatically promote a changeset further than the phases.new-commit value. Note: This may also result in qfinished changeset made public if phases.new-commit is set to public. [1] "In all case" where parent have a compatible phase. Qfinish keep never altering phases of changeset not involved in the qfinish.