transporthandler: Convert ints to enum

We want to be able to identify unique LanParams for each of the
different sub-queries. These make more semantic sense as an enum than
individual ints.

Tested:
    Built and run through unit test suite.

Change-Id: Ieb304f2f866215776e8d3e264b07ea110c639efc
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/transporthandler.hpp b/transporthandler.hpp
index a47b908..d08fef2 100644
--- a/transporthandler.hpp
+++ b/transporthandler.hpp
@@ -18,17 +18,20 @@
 };
 
 // Parameters
-static const int LAN_PARM_INPROGRESS = 0;
-static const int LAN_PARM_AUTHSUPPORT = 1;
-static const int LAN_PARM_AUTHENABLES = 2;
-static const int LAN_PARM_IP = 3;
-static const int LAN_PARM_IPSRC = 4;
-static const int LAN_PARM_MAC = 5;
-static const int LAN_PARM_SUBNET = 6;
-static const int LAN_PARM_GATEWAY = 12;
-static const int LAN_PARM_VLAN = 20;
-static const int CIPHER_SUITE_COUNT = 22;
-static const int CIPHER_SUITE_ENTRIES = 23;
+enum LanParam : uint8_t
+{
+    LAN_PARM_INPROGRESS = 0,
+    LAN_PARM_AUTHSUPPORT = 1,
+    LAN_PARM_AUTHENABLES = 2,
+    LAN_PARM_IP = 3,
+    LAN_PARM_IPSRC = 4,
+    LAN_PARM_MAC = 5,
+    LAN_PARM_SUBNET = 6,
+    LAN_PARM_GATEWAY = 12,
+    LAN_PARM_VLAN = 20,
+    CIPHER_SUITE_COUNT = 22,
+    CIPHER_SUITE_ENTRIES = 23,
+};
 
 constexpr uint8_t SET_COMPLETE = 0;
 constexpr uint8_t SET_IN_PROGRESS = 1;