Extend check_dns.pl to take multiple domains

[EHP4321]

Extend check_dns.pl to take multiple domains that share the same expected result.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
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[EHP4321]

I am new to github, so do let me know if I am doing it wrong.

[EHP4321]

This has been updated with the requested changes to my former MR from another account #338

[KlavsKlavsen]

The failed check above seems unrelated to this change?

 tee /dev/stderr | grep -Eqi '^[02] check_git_checkout_branch.pl_'
3 merge' - Invalid branch name given... must be alphanumeric with dashes and spaces permitted for detached HEADs \n  \n usage: check_git_checkout_branch.pl [ options ] \n  \n -d  --directory     Path to git checkout directory \n -b  --branch        Branch to expect in git checkout directory \n     --git-binary    Path to git binary. Defaults to 'git'. Without relative or \n                     fully qualified path to binary will use $PATH \n -t  --timeout       Timeout in secs ($TIMEOUT... default: 10) \n -v  --verbose       Verbose level ($VERBOSE=<int>... or use multiple -v... -vv... \n                     -vvv) \n -h  --help          Print description and usage options \n -V  --version       Print version and exit