Arcyd: refactor, rename abdi_processrepolist

Rename abdi_processrepolist -> abdi_processrepoarglist in preparation
for consolidating abdi_processrepoargs into it as well.

Refactor performed with rope.

Test Plan:
$ ./precommit.sh
$ git grep abdi_processrepolist
Arcyd: refactor, consolidate abdi_processrepoargs

Move all methods from abdi_processrepoargs to abdi_processrepoarglist
and remove abdi_processrepoargs.

The split between these two files was a little arbitrary and the purpose
of the separate files was a little vague. Make the arcyd entrypoint a
little easier to work on by consolidating them.

Use rope to move the methods.

Test Plan:
$ ./precommit.sh

Make sure there are no more references to removed file
$ git grep abdi_processrepoargs