Fixed KMS master key provider tests when default AWS region is configured#179

Merged

ragona merged 3 commits intoaws:masterfrom

ragona:default-region-test-fixes

Aug 2, 2019

Commits on Jul 27, 2019

Fixed KMS master key provider tests for users who have their default AWS region configured
ragona
committed

Commits on Jul 29, 2019

created fixture for botocore session with no region set
ragona
committed

Commits on Aug 2, 2019

add auto-used fixture in KMS master key provider unit tests to test against both with and without default region
mattsb42-aws
committed