provider/aws: Add per user, role and group policy attachment (superse…

…des #5816) (#6858)

* Add per user, role and group policy attachment

* Add docs for new IAM policy attachment resources.

* Make policy attachment resources manage only 1 entity<->policy attachment

* provider/aws: Tidy up IAM Group/User/Role attachments

r/iam_group_policy_attachment.markdown

@@ -0,0 +1,35 @@
+---
+layout: "aws"
+page_title: "AWS: aws_iam_group_policy_attachment"
+sidebar_current: "docs-aws-resource-iam-group-policy-attachment"
+description: |-
+  Attaches a Managed IAM Policy to an IAM group
+---
+
+# aws\_iam\_group\_policy\_attachment
+
+Attaches a Managed IAM Policy to an IAM group
+
+```
+resource "aws_iam_group" "group" {
+    name = "test-group"
+}
+
+resource "aws_iam_policy" "policy" {
+    name = "test-policy"
+    description = "A test policy"
+    policy = 	#omitted
+}
+
+resource "aws_iam_group_policy_attachment" "test-attach" {
+    group = "${aws_iam_group.group.name}"
+    policy_arn = "${aws_iam_policy.policy.arn}"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `group`		(Required) - The group the policy should be applied to
+* `policy_arn`	(Required) - The ARN of the policy you want to apply

r/iam_role_policy_attachment.markdown

@@ -0,0 +1,35 @@
+---
+layout: "aws"
+page_title: "AWS: aws_iam_role_policy_attachment"
+sidebar_current: "docs-aws-resource-iam-role-policy-attachment"
+description: |-
+  Attaches a Managed IAM Policy to an IAM role
+---
+
+# aws\_iam\_role\_policy\_attachment
+
+Attaches a Managed IAM Policy to an IAM role
+
+```
+resource "aws_iam_role" "role" {
+    name = "test-role"
+}
+
+resource "aws_iam_policy" "policy" {
+    name = "test-policy"
+    description = "A test policy"
+    policy = 	#omitted
+}
+
+resource "aws_iam_role_policy_attachment" "test-attach" {
+    role = "${aws_iam_role.role.name}"
+    policy_arn = "${aws_iam_policy.policy.arn}"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `role`		(Required) - The role the policy should be applied to
+* `policy_arn`	(Required) - The ARN of the policy you want to apply

r/iam_user_policy_attachment.markdown

@@ -0,0 +1,35 @@
+---
+layout: "aws"
+page_title: "AWS: aws_iam_user_policy_attachment"
+sidebar_current: "docs-aws-resource-iam-user-policy-attachment"
+description: |-
+  Attaches a Managed IAM Policy to an IAM user
+---
+
+# aws\_iam\_user\_policy\_attachment
+
+Attaches a Managed IAM Policy to an IAM user
+
+```
+resource "aws_iam_user" "user" {
+    name = "test-user"
+}
+
+resource "aws_iam_policy" "policy" {
+    name = "test-policy"
+    description = "A test policy"
+    policy = 	#omitted
+}
+
+resource "aws_iam_user_policy_attachment" "test-attach" {
+    user = "${aws_iam_user.user.name}"
+    policy_arn = "${aws_iam_policy.policy.arn}"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `user`		(Required) - The user the policy should be applied to
+* `policy_arn`	(Required) - The ARN of the policy you want to apply