Master Branch update tools/checkdomains.sh add fallback dns for dig lookups

update tools/checkdomains.sh add fallback dns for dig lookups

- https://community.centminmod.com/threads/september-6th-2017-epel-yum-repo-dns-issues.12786/#post-54175

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Centmin Mod Github Master branch

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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