Fix invalid type error after failover

[chaodhib]

This PR fixes #550

The change to recv_parse_describe ensures that in case the Protocol & Query's types differ, the Query gets a new ref (to trigger an update to the Ecto cache) and gets the Protocol's types (both of these are done in describe_result/4).

Todo:

• Maybe the same change should be done for the streaming of a prepared query?

[josevalim]

Maybe the same change should be done for the streaming of a prepared query?

I will review this soon but I just want to say the answer to this question is yes. :)

[chaodhib]

Maybe the same change should be done for the streaming of a prepared query?

I will review this soon but I just want to say the answer to this question is yes. :)

ok will do :)

EDIT: done!

[josevalim]

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