dns: fix trivial multi-thread deadlock

Add a simple lock trace mechanism

Type: fix
Ticket: VPP-1752

Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: Idc82b1ad59adb0f7c185d27ced57e9a4c25ce62f
diff --git a/MAINTAINERS b/MAINTAINERS
index 7e4a9d0..f0c2038 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -245,11 +245,6 @@
 M:	Neale Ranns <nranns@cisco.com>
 F:	src/vnet/dhcp/
 
-VNET DNS
-I:	dns
-M:	Dave Barach <dave@barachs.net>
-F:	src/vnet/dns/
-
 VNET TLS and TLS engine plugins
 I:	tls
 M:	Florin Coras <fcoras@cisco.com>
@@ -268,6 +263,11 @@
 M:	Neale Ranns <nranns@cisco.com>
 F:	src/plugins/abf/
 
+Plugin - Simple DNS name resolver
+I:	dns
+M:	Dave Barach <dave@barachs.net>
+F:	src/plugins/dns/
+
 Plugin - Group Based Policy (GBP)
 I:	gbp
 M:	Neale Ranns <nranns@cisco.com>