OpenZFS 6459 - cstyle doesn't detect opening braces on the same line as function...

OpenZFS 6459 - cstyle doesn't detect opening braces on the same line as function header
Authored by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Alex Reece <alex@delphix.com>
Reviewed by: Albert Lee <trisk@omniti.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported-by: George Melikov mail@gmelikov.ru
OpenZFS-issue: https://www.illumos.org/issues/6459
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/c4567a6

Porting notes:
These changes are adopted for ZoL codebase because of
many false positive warnings.