Fix: Default to localhost when no host option, remove entries that are now added automatically

[knagaitsev]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Yes, added a new test for createDomain.

Motivation / Use-Case

Fixes #1743

• Removed one of the entry scripts from the api examples because that is now added automatically
• createDomain should default to localhost when the options.host is not provided, that is what was resulting in 'http:/sockjs-node' without the hostname in the middle.

Breaking Changes

None

Additional Info

[codecov]

Codecov Report

Merging #1750 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1750   +/-   ##
=======================================
  Coverage   86.85%   86.85%           
=======================================
  Files           9        9           
  Lines         578      578           
  Branches      170      170           
=======================================
  Hits          502      502           
  Misses         63       63           
  Partials       13       13

Impacted Files	Coverage Δ
lib/utils/createDomain.js	100% <ø> (ø)	⬆️

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[alexander-akait]

Good work, thanks