Allow requests up to 0.8 and greater

The requests module dropped all configuration with the 1.0.0 release.
There's no danger_mode and no 'verbose'' mode. The former
shouldn't be necessary anymore and the latter can be done by setting
a different log handler for the request.logging root logger.

Change-Id: I41bfaf2574f6d7fc21f86e0124ceae7df6481eee
Signed-off-by: Chuck Short <chuck.short@canonical.com>