Checkstyle maven plugin check - yangtools

    -violations do not fail build
    -rules defined in yangtools/common/checkstyle-logging
	https://git.opendaylight.org/gerrit/#/c/7595/
	https://git.opendaylight.org/gerrit/#/c/7108/

Change-Id: I26bfa119f3484444fe33d47640db7407f9a3cd55
Signed-off-by: Milos Fabian <milfabia@cisco.com>
Merge "Checkstyle maven plugin check - yangtools"