Hide the plumbing diff-{files,index,tree} from bash completion
Hide the plumbing diff-{files,index,tree} from bash completion

The diff-* programs are meant to be plumbing for the diff frontend;
most end users aren't invoking these commands directly.  Consequently
we should avoid showing them as possible completions.

Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

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