git-p4: Remove --log-substitutions feature.
git-p4: Remove --log-substitutions feature.

This turns out to be rarely useful and is already covered by git's commit.template configuration variable.

Signed-off-by: Simon Hausmann <088e16a1019277b15d58faf0541e11910eb756f6@lst.de>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git