ic-proxy: new value "proxy" in GUC gp_interconnect_type

It is for the ic-proxy mode.

src/backend/utils/misc/guc_gp.c

@@ -510,6 +510,9 @@ static const struct config_enum_entry gp_interconnect_fc_methods[] = {
 static const struct config_enum_entry gp_interconnect_types[] = {
 	{"udpifc", INTERCONNECT_TYPE_UDPIFC},
 	{"tcp", INTERCONNECT_TYPE_TCP},
+#ifdef HAVE_LIBUV
+	{"proxy", INTERCONNECT_TYPE_PROXY},
+#endif  /* HAVE_LIBUV */
 	{NULL, 0}
 };
 
@@ -4522,7 +4525,11 @@ struct config_enum ConfigureNamesEnum_gp[] =
 	{
 		{"gp_interconnect_type", PGC_BACKEND, GP_ARRAY_TUNING,
 			gettext_noop("Sets the protocol used for inter-node communication."),
-			gettext_noop("Valid values are \"tcp\" and \"udpifc\".")
+			gettext_noop("Valid values are \"tcp\", \"udpifc\""
+#ifdef HAVE_LIBUV
+						 " and \"proxy\""
+#endif  /* HAVE_LIBUV */
+						 ".")
 		},
 		&Gp_interconnect_type,
 		INTERCONNECT_TYPE_UDPIFC, gp_interconnect_types,

src/include/cdb/cdbvars.h

@@ -280,6 +280,7 @@ typedef enum GpVars_Interconnect_Type
 {
 	INTERCONNECT_TYPE_TCP = 0,
 	INTERCONNECT_TYPE_UDPIFC,
+	INTERCONNECT_TYPE_PROXY,
 } GpVars_Interconnect_Type;
 
 extern int Gp_interconnect_type;