ShadowSocks protocol fixes:

- remote for OpenVPN is set to real ip address
- remote ip will be added as alias in docker container
- ss-local graceful shutdown
- crash fixes

client/server_scripts/setup_firewall.sh

@@ -1,3 +1,3 @@
-sysctl -w net.ipv4.ip_forward=1
-iptables -P FORWARD ACCEPT
-iptables -A INPUT -p icmp --icmp-type echo-request -j DROP
+sudo sysctl -w net.ipv4.ip_forward=1
+sudo iptables -P FORWARD ACCEPT
+sudo iptables -A INPUT -p icmp --icmp-type echo-request -j DROP