apibuild: Remove whitespace before ', ' and ':'

apibuild: Remove whitespace before ', ' and ':'

PEP8 recommends removing whitespace immediately before a comma,
semicolon, or colon [1]. In addition remove multiple spaces after
keyword (PEP8 - E271).

1: https://www.python.org/dev/peps/pep-0008/#whitespace-in-expressions-and-statements

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Radostin Stoyanov <rstoyanov1@gmail.com>