Update shell completions

There's some strange changes of what completions are being generated
for inputs that take multiple files when generated by different 4.6.x
versions, but nobody seems to know what is going on. Also, those
problems do not have a large impact.

Refs #1159

Change-Id: Ib4b1ad4999e1b68904d46b0d01c2a5dd07507fd7