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Add 'unix_socket' to kwargs if host is 'localhost'.
It seems that when the host is set to 'localhost',
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due to some MySQL configuration options.
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we should include the 'unix_socket' query parameter.
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Get a modified RFC 1738 URL for a MySQL database connection.
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Get the Unix socket path for MySQL connection.
Check Plesk and MySQL config files for the socket path.
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Get all included config files paths in the given config file
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