kcptun: bump to v20190924, add new config options

This commit updates:
- bump version to v20190924
- add new options for latest release
  (https://github.com/xtaci/kcptun/releases/tag/v20190924)

Signed-off-by: Chao Liu <expiron18@gmail.com>

net/kcptun/files/kcptun.init

@@ -58,7 +58,9 @@ kcptun() {
 	[ -z "$dscp" ] || json_add_int dscp "$dscp"
 	json_add_boolean nocomp "$nocomp"
 	[ -z "$sockbuf" ] || json_add_int sockbuf "$sockbuf"
+	[ -z "$smuxver" ] || json_add_int smuxver "$smuxver"
 	[ -z "$smuxbuf" ] || json_add_int smuxbuf "$smuxbuf"
+	[ -z "$streambuf" ] || json_add_int streambuf "$streambuf"
 	[ -z "$keepalive" ] || json_add_int keepalive "$keepalive"
 	[ -z "$snmplog" ] || json_add_string snmplog "$snmplog"
 	[ -z "$snmpperiod" ] || json_add_int snmpperiod "$snmpperiod"
@@ -132,7 +134,9 @@ validate_common_options() {
 		'dscp:uinteger' \
 		'nocomp:bool' \
 		'sockbuf:uinteger' \
+		'smuxver:uinteger' \
 		'smuxbuf:uinteger' \
+		'streambuf:uinteger' \
 		'keepalive:uinteger' \
 		'snmplog:string' \
 		'snmpperiod:uinteger' \