Augment metrics model to monitor more # of control metrics

Existing implementation only monitors OpenFlow messages.
This commit augments the metrics model in a way to monitor more
number of control metrics including
- CPU Load, total CPU time, sys CPU time, user CPU time, etc.
- Used memory percentage, free memory percentage
- Disk read/write bytes
- Network incoming/outgoing bytes/packets

Change-Id: I9e8eee163c3033132eb202f3c75bad246c87f133
diff --git a/apps/cpman/pom.xml b/apps/cpman/pom.xml
index 5b89e01..f79b9ff 100644
--- a/apps/cpman/pom.xml
+++ b/apps/cpman/pom.xml
@@ -34,8 +34,7 @@
         <onos.app.name>org.onosproject.cpman</onos.app.name>
         <onos.app.category>default</onos.app.category>
         <onos.app.url>http://onosproject.org</onos.app.url>
-        <onos.app.readme>Control plane management application.
-        </onos.app.readme>
+        <onos.app.readme>Control plane management application.</onos.app.readme>
     </properties>
 
     <dependencies>