[MERGE] Default to urllib for http connections

[John Arbash Meinel]

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This patch changes the default http provider from http+pycurl to
http+urllib.

The motivation is that in general, urllib provides better results. It
can be interrupted, it removes a dependency on a 3rd-party library which
seems to change in random and often incompatible ways, etc.

The main reason we have kept pycurl around is because urllib doesn't
verify the ssl certificate chain for https connections. However, that
doesn't bring any benefit to http connections.

John
=:->

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