This also upgrades the Requests dependency to 2.4+ (released in 2014)
to avoid having to do version comparisons altogether.
Refs https://bugs.launchpad.net/python-swiftclient/+bug/1904551
Signed-off-by: Aarni Koskela <akx@iki.fi>
Change-Id: I58399f6c526b0b78462f31739c43076314ba9e76
