[cherry-pick] Add ASG MixedInstancesPolicy Support 1.13

[danigrmartinez]

Related to 1.14 release cherrypick PR #2013

This is a cherrypick of the two PR. Code and documentation from @drewhemm
#1886
#1983

[losipiuk]

/lgtm
/approve
Thanks!

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[losipiuk]

@danigrmartinez for this one tests are failing. Please fix :)
/lgtm cancel

[Jeffwan]

Looks like aws sdk doesn't have MixedInstancePolicy support in this version. Let me double verify it.

[danigrmartinez]

@Jeffwan you are right. The versions of the AWS cli is not compatible with the new feature:

For 1.13

		{
			"ImportPath": "github.com/aws/aws-sdk-go/aws",
			"Comment": "v1.14.12",
			"Rev": "fde4ded7becdeae4d26bf1212916aabba79349b4"
		},

for 1.14:

		{
			"ImportPath": "github.com/aws/aws-sdk-go/aws",
			"Comment": "v1.16.26-2-g6f009370",
			"Rev": "6f009370adb66b6023fcea53c6aa8e93682b7151"
		},

In that case, I don't think we should include this on 1.13 or 1.12.

[danigrmartinez]

Closing this because aws sdk version is not compratible with MixedInstancePolicy support

[Jeffwan]

@danigrmartinez I remember the aws sdk version comes from kubernetes/kubernetes. If that's the true, there's a dependency and we can not easily upgrade it. Let me double check