Set cxn driver before connect() [URGENT]
Set cxn driver before connect() [URGENT]

Every provider that implements the new API properly should have failed
tests for this, given that it attempts to send a default header on every
request which REQUIRES a non-None driver. I find this rather
disconcerting.

git-svn-id: 353d90d4d8d13dcb4e0402680a9155a727f61a5a@886511 13f79535-47bb-0310-9956-ffa450edef68

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