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* api-change:``ce``: Update ce client to latest version
* enhancement:Credentials: Add the ability to disable fetching credentials from EC2 metadata by setting the environment variable AWS_EC2_METADATA_DISABLED to 'true'.
* api-change:``config``: Update config client to latest version
* api-change:``elasticbeanstalk``: Update elasticbeanstalk client to latest version
* api-change:``glue``: Update glue client to latest version
* api-change:``medialive``: Update medialive client to latest version
* bugfix:Credentials: Fix a race condition related to assuming a role for the first time (`1405 <https://github.com/boto/botocore/pull/1405>`__)
* api-change:``events``: Update events client to latest version
* api-change:``ecs``: Update ecs client to latest version