Changelog:
==========
Features
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AwsCredentials should not call metadata server if security creds and region are retrievable through the environment variables (#1195) (5e27c8f)
Wrap all python built-in exceptions into library excpetions (#1191) (a83af39)
Bug Fixes
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Allow get_project_id to take a request (#1203) (9a4d23a)
Make OAUTH2.0 client resistant to string type 'expires_in' responses from non-compliant services (#1208) (9fc7b1c)
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
