Implement the rdc_lib API to support the job stats

Add the function to start and stop the job recording.
Add the function to get the job stats for each GPU and summary of multiple GPUs
Add the function to remove the jobs.

Add a class RdcLogger which can control the log level using the environment variable RDC_LOG.
This is similar to GRPC_VERBOSITY gRPC. When the customer has the issues, he can enable the verbose
log to help us to troubleshoot the issues.

Add the -u support in the rdci group, fieldgroup and dmon for connecting to rdcd without authentication.

Change-Id: I22c591823c1ee6485db106b911bed8271d1b2769

include/rdc/rdc.h

@@ -52,6 +52,7 @@ typedef enum {
      RDC_ST_NOT_FOUND,          //!< Cannot find the value
      RDC_ST_CONFLICT,           //!< Conflict with current state
      RDC_ST_CLIENT_ERROR,       //!< The RDC client error
+     RDC_ST_ALREADY_EXIST,      //!< The item already exists
      RDC_ST_MAX_LIMIT               //!< Max limit recording for the object
 } rdc_status_t;
 
@@ -371,15 +372,10 @@ rdc_status_t rdc_disconnect(rdc_handle_t p_rdc_handle);
  *
  *  @param[in] update_freq  How often to update this field in usec.
  *
- *  @param[in] max_keep_age How long to keep data for this field in seconds.
- *
- *  @param[in] max_keep_samples Maximum number of samples to keep. 0=no limit.
- *
  *  @retval ::RDC_ST_OK is returned upon successful call.
  */
 rdc_status_t rdc_job_start_stats(rdc_handle_t p_rdc_handle,
-    rdc_gpu_group_t group_id, char  job_id[64], uint64_t update_freq,
-            double  max_keep_age, uint32_t  max_keep_samples);
+    rdc_gpu_group_t group_id, char job_id[64], uint64_t update_freq);
 
 /**
  *  @brief Get the stats of the job using the job id.
@@ -415,6 +411,35 @@ rdc_status_t rdc_job_get_stats(rdc_handle_t p_rdc_handle, char  job_id[64],
 rdc_status_t rdc_job_stop_stats(rdc_handle_t p_rdc_handle,
             char  job_id[64]);
 
+/**
+ *  @brief Request RDC to stop tracking the job given by job_id
+ *
+ *  @details After this call, you will no longer be able to call
+ *  rdc_job_get_stats() on this job_id. But you will be able to reuse
+ *  the job_id after this call.
+ *
+ *  @param[in] p_rdc_handle The RDC handler.
+ *
+ *  @param[in] job_id The name of the job.
+ *
+ *  @retval ::RDC_ST_OK is returned upon successful call.
+ */
+rdc_status_t rdc_job_remove(rdc_handle_t p_rdc_handle,
+            char  job_id[64]);
+
+/**
+ *  @brief Request RDC to stop tracking all the jobs
+ *
+ *  @details After this call, you will no longer be able to call
+ *  rdc_job_get_stats() on any job id. But you will be able to reuse
+ *  the any previous used job id after this call.
+ *
+ *  @param[in] p_rdc_handle The RDC handler.
+ *
+ *  @retval ::RDC_ST_OK is returned upon successful call.
+ */
+rdc_status_t rdc_job_remove_all(rdc_handle_t p_rdc_handle);
+
 /**
  *  @brief Request RDC to update all fields to be watched.
  *