Add PostgreSQL SSL options support

[oldskool]

I was trying to setup an SSL connection to a PostgreSQL database, using the pdo_pgsql driver. According to the documentation, the following SSL options should be supported:

• sslmode
• sslrootcert
• sslcert
• sslkey
• sslcrl

Although, when setting the configuration as such (with the given parameters set in parameters.yml file):

doctrine:
  dbal:
    sslmode: 'verify-ca'
    sslrootcert: '%database_sslrootcert_path%'
    sslcert: '%database_sslcert_path%'
    sslkey: '%database_sslkey_path%'

I would get the following exception from the Symfony Config component:

In ArrayNode.php line 311:
                                                                                    
  [Symfony\Component\Config\Definition\Exception\InvalidConfigurationException]     
  Unrecognized options "sslcert, sslkey" under "doctrine.dbal.connections.default"

This patch allows for these options to be actually set/used and results in a working SSL connection.

I'm not sure if/how I should write any tests for this change, but please give me some pointers if these need to be added.

[k20human]

Any news on this ?

[kimhemsoe]

@oldskool Can you provide some tests?

[oldskool]

@kimhemsoe I checked the current source against occurences of the sslrootcert key that was already there and supported. I basically added the "new" sslcert, sslkey and sslcrl keys to this files as well. I figure the complete configuration is tested against the DI test, so this might be sufficient?

If more tests need to be added, please let me know!

[oldskool]

@kimhemsoe Were the tests sufficient or do additional tests need to be added before this can be merged?

[kimhemsoe]

@oldskool Thanks, sorry missed that you already had added the tests