Checkstyle plugin check - config & netconf

-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: I2b1c458c09068c4a520afe37b3adb26e503882ba
Signed-off-by: Milos Fabian <milfabia@cisco.com>
Merge "Checkstyle plugin check - config & netconf"