Set maximum vpn clients

src/freedombone-app-vpn

     sed -i 's|;push "dhcp-option|push "dhcp-option|g' /etc/openvpn/server.conf
     sed -i 's|;user nobody|user nobody|g' /etc/openvpn/server.conf
     sed -i 's|;group nogroup|group nobody|g' /etc/openvpn/server.conf
+    sed -i 's|;max-clients.*|max-clients 2|g' /etc/openvpn/server.conf
 
     echo 1 > /proc/sys/net/ipv4/ip_forward
     sed -i 's|# net.ipv4.ip_forward|net.ipv4.ip_forward|g' /etc/sysctl.conf