MAINTAINERS: Add tests/docker

Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NFam Zheng <famz@redhat.com>
Message-id: 1464755128-32490-16-git-send-email-famz@redhat.com

MAINTAINERS

@@ -1615,3 +1615,10 @@ Build system architecture
 M: Daniel P. Berrange <berrange@redhat.com>
 S: Odd Fixes
 F: docs/build-system.txt
+
+Docker testing
+--------------
+Docker based testing framework and cases
+M: Fam Zheng <famz@redhat.com>
+S: Maintained
+F: tests/docker/