pep8: Fix indentation in supervdsmServer

Fix pep8 issue in supervdsmServer and added its path to PEP8_WHITELIST
to make sure don't oversee other pep8 issues in the file.

Change-Id: I6af53e01ce7da4c802d65dac19df87e31d60c7fe
Signed-off-by: Dima Kuznetsov <dkuznets@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/27899
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>