Adds openstack_region parameter to OpenStack Identity Service
add block_device_mapping_v2
fixup! example block_device_mapping_v2
fixup!
[google|storage] Reintroduce workaround for excon headers issue while keeping fix where file_data was not being saved.
[storage|aws] fix redirect follower + v4 sig regression

closes #3275
[Docker] Environment variables support
Add AssumeRoleWithSAML support for AWS
Ensure that if the aws credentials requests requiring the signature fail
Fix link to documentation
Fix code style
Add simple test
[aws|s3] add changelog note about 7 day expiry

closes #3277
Merge pull request #3270 from eLobato/docker_env_variables

[Docker] Environment variables support
[aws|storage] redirect fixes to match latest and v4 sigs
Merge pull request #3273 from 0x414f/master

[google|storage] Reintroduce workaround for excon headers issue while ke...
Rescue "Illegal Seek" exception in case body is a pipe or socket
Merge pull request #3282 from giddie/pipes-to-s3

[AWS | Storage] Rescue "Illegal Seek" exception in case body is a pipe or socket
ensure version is required

closes #3281
[storage|aws] further fixes around region redirecting