Master Branch fix SECOND_IP usage in centmin.sh menu option 2 in 123.09beta01

fix SECOND_IP usage in centmin.sh menu option 2 in 123.09beta01

- Fix for SECOND_IP persistent config file /etc/centminmod/custom_config.inc usage with centmin.sh menu option 2 Nginx vhost site creation routine's Letsencrypt SSL certificate DNS domain checks https://community.centminmod.com/threads/additional-ip-and-nginx-setup.18393/page-2#post-79459.
- When SECOND_IP is setup https://community.centminmod.com/threads/update-nginx-vhost-generator-routines-support-second-ip.5292/ and a 2nd IP address is properly added to the server, do the DNS domain checks to see if SECOND_IP was added to local server networking via ip command instead of ifconfig command. Seems on some servers added additional IPs don't show up in ifconfig output but do for ip command output.

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Centmin Mod Github Master branch

Master branch is where most recent commits are made as at May 24, 2015.

• Branch: https://github.com/centminmod/centminmod
• Commit History: https://github.com/centminmod/centminmod/commits/master

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