shadowsocks-libev: move plugin options to server section

Plugin options are properties of shadowsocks deployment as a whole,
including both server and each client components.  Multiple client
instances accessing the same server will need to share the same plugin
settings

With this change, plugin options will need to specified to "server" and
"ss-server" section, not to each component section.

Fixes: c19e949 ("shadowsocks-libev: add plugin options support")
Reference: https://github.com/openwrt/packages/issues/8903#issuecomment-489674137
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

net/shadowsocks-libev/files/shadowsocks-libev.init

@@ -30,6 +30,8 @@ ss_mkjson_server_conf_() {
 	[ -z "$method" ] || json_add_string method "$method"
 	[ -z "$key" ] || json_add_string key "$key"
 	[ -z "$password" ] || json_add_string password "$password"
+	[ -z "$plugin" ] || json_add_string plugin "$plugin"
+	[ -z "$plugin_opts" ] || json_add_string plugin_opts "$plugin_opts"
 }
 
 ss_mkjson_ss_local_conf() {
@@ -73,8 +75,6 @@ ss_xxx() {
 	[ -z "$mode" ] || json_add_string mode "$mode"
 	[ -z "$mtu" ] || json_add_int mtu "$mtu"
 	[ -z "$timeout" ] || json_add_int timeout "$timeout"
-	[ -z "$plugin" ] || json_add_string plugin "$plugin"
-	[ -z "$plugin_opts" ] || json_add_string plugin_opts "$plugin_opts"
 	[ -z "$user" ] || json_add_string user "$user"
 	json_dump -i >"$confjson"
 
@@ -214,7 +214,9 @@ validate_common_server_options_() {
 		'server_port:port' \
 		'password:string' \
 		'key:string' \
-		"method:or($stream_methods, $aead_methods)"
+		"method:or($stream_methods, $aead_methods)" \
+		'plugin:string' \
+		'plugin_opts:string'
 }
 
 validate_common_client_options_() {
@@ -239,8 +241,6 @@ validate_common_options_() {
 		'mode:or("tcp_only", "udp_only", "tcp_and_udp"):tcp_only' \
 		'mtu:uinteger' \
 		'timeout:uinteger' \
-		'plugin:string' \
-		'plugin_opts:string' \
 		'user:string'
 }