abdi_repoargs: review & branch urls not required

Revert change introduced in c52795f820f027ba02e4f6c28d28512d48f0aa7f
accidentally - 'review-url-format' and 'branch-url-format' should not be
required parameters.

Test Plan:
$ ./precommit.sh
$ ./testbed/arcyd/loop_test.sh (broken by previous change)
Arcyd: don't print status line to stdout

Arcyd will be run as a daemon rather than interactively on the
command-line, the only time this output seems to show up is by accident,
when it generally gets in the way.

Consequently remove dead module 'phlsys_statusline'.

Test Plan:
$ ./precommit.sh
$ ./testbed/arcyd/acceptance_tests.sh
$ ./testbed/arcyd/loop_test.sh