provider/aws: Add IAMGroupMembership resource

[catsby]

Bare bones implementation of a Group Membership resource

• 1:1 mapping of group and user

Syntax:

resource "aws_iam_group_association" "dev" {
    name = "dev"
    users = [
        "${aws_iam_user.dev1.name}",
        "${aws_iam_user.dev2.name}",
        ...
    ]
    group = "${aws_iam_group.dev.name}"
}

Remaining:

• update method
• docs

[catsby]

#2274 points out that I didn't bother giving this resource a name attribute, which I should... done in 96a28a0

[catsby]

@graycoder @ctiwald take a look and let me know

[phinze]

Missing a file here? Can't find the page this links to.

[catsby]

derp, added

[ctiwald]

LGTM. Thanks for the great feature add @catsby.

[phinze]

The schema.Resource code handles the clearing of ID for you on successful return from a Delete func.

[phinze]

@clint: this makes sense to me - nit on the helper method name but i'm good to merge as-is. LGTM!

[ghost]

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