The collectd plugin for RDC

Two files are added to the python_binding folder:
* The rdc_collectd.py is a collectd plugin to store the RDC
  metrics to the collectd round robin database.
* The rdc_collectd.conf is a configure file which can control
  which fields to collect, how frequently the fields can be collected
  and run the plugin in embedded mode.

Change-Id: Ief44d004376ca8a82ed0d8ad36805243acb47080

python_binding/rdc_collectd.conf

@@ -0,0 +1,24 @@
+ <Plugin python>
+    ModulePath "/opt/rocm/rdc/python_binding"
+    LogTraces true
+    Interactive false
+    Import "rdc_collectd"
+    <Module rdc_collectd>
+        # Run RDC in embedded mode (default: standalone mode)
+        embedded false
+        # The rdcd IP and port in standalone mode (default: localhost:50051)
+        rdc_ip_port "localhost:50051"
+        # Set this option if the rdcd is running with unauth in standalone mode (default: false)
+        unauth false
+        # The list of fields name needs to be watched (default: fields in the plugin), for example
+        # field_ids "RDC_FI_GPU_TEMP" "RDC_FI_GPU_CLOCK"
+        # The fields update frequency in seconds (default: 10)
+        update_freq 10
+        # The max keep age of the fields in seconds (default: 3600)
+        max_keep_age 3600
+        # The max samples to keep for each field in the cache (default: 1000)
+        max_keep_samples 1000
+        # The list of GPUs to be watched (default: All GPUs), for example
+        # gpu_indexes 0 1
+    </Module>
+ </Plugin>