Fix a recursive header include

The test-config-parse-logfile test case recursively includes
console-server.h.

Change-Id: I699ba24ece8671a0529cae3e25e258db811d33f5
Signed-off-by: Johnathan Mantey <johnathanx.mantey@intel.com>
diff --git a/console-server.h b/console-server.h
index 9bb12ba..cac88d1 100644
--- a/console-server.h
+++ b/console-server.h
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#pragma once
+
 #include <poll.h>
 #include <stdbool.h>
 #include <stdint.h>