Improve serve Command Reliability

[armanist]

Closes #399

[codecov]

Codecov Report

❌ Patch coverage is 0% with 94 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.90%. Comparing base (c2efe7a) to head (0dccf49).
⚠️ Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Console/Commands/ServeCommand.php	0.00%	94 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #406      +/-   ##
============================================
- Coverage     80.67%   79.90%   -0.77%     
- Complexity     2472     2492      +20     
============================================
  Files           229      229              
  Lines          6546     6609      +63     
============================================
  Hits           5281     5281              
- Misses         1265     1328      +63     

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[andrey-smaelov]

The server not binds next available port if second server is run, this creates serious issue.

Steps to reproduce:

1. Run php qt serve -o
   This will run the php server and will open browser on http://127.0.0.1:8000
2. Run second time php qt serve -o
   Same way browser is opened but still on http://127.0.0.1:8000

Expected behavior:

Second server should be run on port 8001