Replacing Enumerable::Enumerator with Enumerator

[david-a]

Fixes the error undefined method each for Enumerable::Enumerator
This occurs where there's another Enumerable module defined in the environment, and it has an Enumerator class defined without each and next methods.

Issue: #1738

[awood45]

Is it possible for you to add a (previously) failing test to the spec suite that reflects the error?

It otherwise looks good, and happy to help if you're not sure about the best way to do this.

[david-a]

Sure, I'll look into it later today.
Thanks for your quick response!

[david-a]

@awood45 done :)
I've looked deeper into it, and this issue occurs only in environments which have another Enumerable module defined, and this module has an Enumerator class defined without each and next methods.
Somehow my environment has this module, and I know it may be an edge case, but it won't hurt to add those :: as a precaution.

[david-a]

Just want to update, I've found the cause for the problematic (empty) definition of Enumerable::Enumerator in my environment - for me it was the gem CFPropertyList-rails (v1.0.2) which uses an old version of CFPropertyList (v2.2.8).

[cjyclaire]

Thanks! Could you also add a changelog entry here, such that your changes can be included in the next release of aws-sdk-core gem?

[david-a]

@cjyclaire sure, under what version number?

[cjyclaire]

Under "unreleased changes" section is fine, just follow the format to add an entry. Our build tools will auto bump the version in the next release : )

[david-a]

@cjyclaire done, I hope it's ok now

[cjyclaire]

Thanks for the contribution! Merged