MAINTAINERS: Add tests/docker

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1464755128-32490-16-git-send-email-famz@redhat.com
diff --git a/MAINTAINERS b/MAINTAINERS
index 3c949d5..091272e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1615,3 +1615,10 @@
 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/