fix: postpone initialize

[alexander-akait]

• 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?

WIP

Motivation / Use-Case

fixes #3351

Breaking Changes

No

Additional Info

postpone initialize so dev server plugin will use resolved host and port (when we use auto for the "port" option or local-ipv4/etc for "host")

[codecov]

Codecov Report

Merging #3467 (9b5833e) into master (0020f3e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3467      +/-   ##
==========================================
+ Coverage   94.35%   94.38%   +0.02%     
==========================================
  Files          26       26              
  Lines        1276     1282       +6     
  Branches      402      405       +3     
==========================================
+ Hits         1204     1210       +6     
- Misses         66       67       +1     
+ Partials        6        5       -1     

Impacted Files	Coverage Δ
bin/cli-flags.js	100.00% <ø> (ø)
lib/Server.js	94.35% <100.00%> (+0.04%)	⬆️
lib/utils/DevServerPlugin.js	97.61% <100.00%> (+0.01%)	⬆️
lib/utils/normalizeOptions.js	96.55% <100.00%> (ø)

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