git-p4: sort and de-duplcate pylint disable list

git-p4: sort and de-duplcate pylint disable list

git-p4 contains configuration commands for pylint embedded in the header
comment.

Previously, these were combined onto single lines and not alphabetically
sorted. This patch breaks each disable command onto a separate line to
give cleaner diffs, removed duplicate entries, and sorts the list
alphabetically.

Signed-off-by: Joel Holdsworth <jholdsworth@nvidia.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>