[ONOS-6879] Adding Controller Metrics Application, To retrive memory, Disk and CPU usage for all controller

Change-Id: I5976f0194555c1c3c42d6b6d09c468d6dfc983ff
diff --git a/features/BUCK b/features/BUCK
index 2dd925c..03ee6cf 100644
--- a/features/BUCK
+++ b/features/BUCK
@@ -42,6 +42,7 @@
     '//lib:commons-jxpath', # FIXME: move xpath lib dependency to the right place
     '//lib:commons-beanutils', # jxpath dependency
     '//lib:jdom',  # jxpath dependency
+    '//lib:sigar',
   ]
 )