git-p4: ensure there is a single space around all operators

git-p4: ensure there is a single space around all operators

PEP8 requires that binary operators such as assignment and comparison
operators should always be surrounded by a pair of single spaces, and
recommends that all other binary operators should typically be surround
by single spaces.

The recommendation is given here in the "Other Recommendations"
section

https://www.python.org/dev/peps/pep-0008/#other-recommendations

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