[CONTRIB] Update Cacti Tempates

This patch adds new haproxy_socket.xml template and updates
haproxy_backend.xml and haproxy_frontend.xml templates.
(cherry picked from commit 67cd1d55b5513e4186f021a7014e9442fd7a710f)
diff --git a/contrib/netsnmp-perl/haproxy_backend.xml b/contrib/netsnmp-perl/haproxy_backend.xml
index 9bbde2f..a5dbe54 100644
--- a/contrib/netsnmp-perl/haproxy_backend.xml
+++ b/contrib/netsnmp-perl/haproxy_backend.xml
@@ -37,13 +37,6 @@
 			<direction>output</direction>
 			<oid>.1.3.6.1.4.1.29385.106.1.1.7</oid>
 		</beSTot>
-		<beEResp>
-			<name>Response Errors</name>
-			<method>get</method>
-			<source>value</source>
-			<direction>output</direction>
-			<oid>.1.3.6.1.4.1.29385.106.1.1.14</oid>
-		</beEResp>
 		<beBIn>
 			<name>Bytes In</name>
 			<method>get</method>
@@ -58,5 +51,33 @@
 			<direction>output</direction>
 			<oid>.1.3.6.1.4.1.29385.106.1.1.9</oid>
 		</beBOut>
+		<beEConn>
+			<name>Connection Errors</name>
+			<method>get</method>
+			<source>value</source>
+			<direction>output</direction>
+			<oid>.1.3.6.1.4.1.29385.106.1.1.13</oid>
+		</beEConn>
+		<beEResp>
+			<name>Response Errors</name>
+			<method>get</method>
+			<source>value</source>
+			<direction>output</direction>
+			<oid>.1.3.6.1.4.1.29385.106.1.1.14</oid>
+		</beEResp>
+		<beLBTot>
+			<name>LB Total</name>
+			<method>get</method>
+			<source>value</source>
+			<direction>output</direction>
+			<oid>.1.3.6.1.4.1.29385.106.1.1.30</oid>
+		</beLBTot>
+		<beDReq>
+			<name>Denied Requests</name>
+			<method>get</method>
+			<source>value</source>
+			<direction>output</direction>
+			<oid>.1.3.6.1.4.1.29385.106.1.1.10</oid>
+		</beDReq>
 	</fields>
 </interface>