Handle different levels of rdcd privilege

Depending on how a user starts rdcd, rdcd will either have
full monitor/control capabilities or have just monitoring
capabilties.

The only 2 user ids allowed are "rdc" and root.

Change-Id: Ie296a2f68c9723bef5945b1af1070ef99eeea93b

include/rdc/rdc.h

@@ -20,8 +20,8 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
 
-#ifndef RDC_RDC_H_
-#define RDC_RDC_H_
+#ifndef INCLUDE_RDC_RDC_H_
+#define INCLUDE_RDC_RDC_H_
 
 #include <cstdint>
 
@@ -740,4 +740,4 @@ const char* rdc_status_string(rdc_status_t status);
  */
 const char* field_id_string(uint32_t field_id);
 
-#endif  // RDC_RDC_H_
+#endif  // INCLUDE_RDC_RDC_H_