Add SSL mutual authentication support for rdci

The RDC API is changed to pass the certificates to the gRPC.

Add the support to add all GPUs in the host to a group. Also before
add a GPU to a group, the RDC API will verify that GPU exists or not.

Add the support to fetch the temperature metrics.

Change-Id: I5857ef03fede233d16e8b2836be120f33172da93

include/rdc_lib/impl/RdcGroupSettingsImpl.h

@@ -34,7 +34,7 @@ namespace rdc {
 
 class RdcGroupSettingsImpl: public RdcGroupSettings {
  public:
-      rdc_status_t rdc_group_gpu_create(rdc_group_type_t type,
+      rdc_status_t rdc_group_gpu_create(
         const char* group_name, rdc_gpu_group_t* p_rdc_group_id) override;
       rdc_status_t rdc_group_gpu_destroy(
         rdc_gpu_group_t p_rdc_group_id) override;