SharedConfigState (work in progress)

[mousedownmike]

Issue #, if available:

#74 use of a credential profile

Description of changes:

I'm loading the AWS Region based on the region set in the local profile. The summary of key changes are:

• getDefaultSession now enables the SharedConfigState option.
• if noMetadata is set to true, we load the region from Session.Config.Region

I've gone through a few iterations attempting to find the best place to put this check and I'm not sure I have it where it should go.
It does work for me locally but I'm not 100% sure it won't interfere with other use cases. I haven't been able to completely follow the EC2 metadata flows.

While I have confirmed that my traces are being published as expected (using my profile and that profile's region), I do get a context canceled error like:

2020-12-12T10:20:11-08:00 [Debug] Received request on HTTP Proxy server : /GetSamplingRules
2020/12/12 10:20:18 http: proxy error: context canceled

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[wangzlei]

@mousedownmike Kindly ask, this PR still work in progress?

[mousedownmike]

Hi @wangzlei I marked it as a "work in progress" to indicate it works for my use case but I'm not sure what the other use cases are. If it works where you expect it to, it should be good.