Building AWS C++ SDK as external project needs CMake 2.8.12
Centos7 out of the box has 2.8.11, thus the build fails.
Fixed check for required CMake version.
AWS C++ SDK always defaults region to us-east-1 for clientConfiguration
(ignoring config file or env.variable)
This patch introduces a plugin variable 'region' to make it usable
for master keys created in regions other than 'us-east-1'.
- Library path's are different now
- New dependency on Linux libuuid
- Add calls for SDK Initialization/shutdown
- Also add request_timeout parameter, default SDK HTTPs timeout appears
to be too short in my tests
