Allow to enforce IPv4 or IPv6 in URL-like connection strings
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                 Key: CORE-5229
                 URL: http://tracker.firebirdsql.org/browse/CORE-5229
             Project: Firebird Core
          Issue Type: Improvement
          Components: API / Client Library
            Reporter: Dmitry Yemanov
            Priority: Minor


Extend the new URL-style connection string format to restrict name lookup to 
only IPv4 or IPv6 addresses:

  connect 'inet://server.example.org/test';
  connect 'inet4://server.example.org/test';
  connect 'inet6://server.example.org/test';

First example tries all addresses, second only IPv4 ones, third only IPv6ones. 
This can be used to avoid connection delays on systems where name lookup 
returns IPv6 addresses for some host names but attempts to connect to them time 
out rather than failing immediatelly (as reported, this can happen even for 
name "localhost" on some systems).

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