<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Explain the problem briefly below -->

attempting to use iam_policy module in govcloud and it results in the error:

"Region us-gov-east-1 does not seem to be available for aws module boto.iam. If the region definitely exists, you may need to upgrade boto or extend with endpoints_path"

the same playbook works fine in us-gov-west

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->

iam_policy

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```
{
    "exception": "Traceback (most recent call last):\n  File \"/root/.ansible/tmp/ansible-tmp-1572882827.2-191594499800419/AnsiballZ_iam_policy.py\", line 114, in <module>\n    _ansiballz_main()\n  File \"/root/.ansible/tmp/ansible-tmp-1572882827.2-191594499800419/AnsiballZ_iam_policy.py\", line 106, in _ansiballz_main\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\n  File \"/root/.ansible/tmp/ansible-tmp-1572882827.2-191594499800419/AnsiballZ_iam_policy.py\", line 49, in invoke_module\n    imp.load_module('__main__', mod, module, MOD_DESC)\n  File \"/tmp/ansible_iam_policy_payload_1NDwn0/__main__.py\", line 351, in <module>\n  File \"/tmp/ansible_iam_policy_payload_1NDwn0/__main__.py\", line 325, in main\n  File \"/tmp/ansible_iam_policy_payload_1NDwn0/ansible_iam_policy_payload.zip/ansible/module_utils/ec2.py\", line 340, in connect_to_aws\nansible.module_utils.ec2.AnsibleAWSError: Region us-gov-east-1 does not seem to be available for aws module boto.iam. If the region definitely exists, you may need to upgrade boto or extend with endpoints_path\n",
    "_ansible_no_log": false,
    "module_stderr": "Traceback (most recent call last):\n  File \"/root/.ansible/tmp/ansible-tmp-1572882827.2-191594499800419/AnsiballZ_iam_policy.py\", line 114, in <module>\n    _ansiballz_main()\n  File \"/root/.ansible/tmp/ansible-tmp-1572882827.2-191594499800419/AnsiballZ_iam_policy.py\", line 106, in _ansiballz_main\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\n  File \"/root/.ansible/tmp/ansible-tmp-1572882827.2-191594499800419/AnsiballZ_iam_policy.py\", line 49, in invoke_module\n    imp.load_module('__main__', mod, module, MOD_DESC)\n  File \"/tmp/ansible_iam_policy_payload_1NDwn0/__main__.py\", line 351, in <module>\n  File \"/tmp/ansible_iam_policy_payload_1NDwn0/__main__.py\", line 325, in main\n  File \"/tmp/ansible_iam_policy_payload_1NDwn0/ansible_iam_policy_payload.zip/ansible/module_utils/ec2.py\", line 340, in connect_to_aws\nansible.module_utils.ec2.AnsibleAWSError: Region us-gov-east-1 does not seem to be available for aws module boto.iam. If the region definitely exists, you may need to upgrade boto or extend with endpoints_path\n",
    "changed": false,
    "module_stdout": "",
    "rc": 1,
    "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error"
}

```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```no output
```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -
dont think anything that stands out or is relevant in this case
->


##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

use iam_policy with the region targeting us-gov-east-1, in our case we just wanted to create a policy.

```

```

<!--- Paste example playbooks or commands between quotes below -->
```
- name: Create IAM Policy for the Audit S3 bucket
  iam_policy:
    iam_type: role
    iam_name: "some_name"
    region: "{{ a var that results in us-gov-east-1 }}"
    policy_name: some_policy_name
    policy_json: "{{ lookup('stuff for policy json') }}"
    state: present

```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
i expected the same results as with gov west, which was successful

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->

the error described above

<!--- Paste verbatim command output between quotes -->
```
have pasted above
```

required: true
    type: str
  policy_name:
    description:
      - The name label for the policy to create or remove.
    required: true
    type: str
  policy_document:
    description:
      - The path to the properly json formatted policy file.
      - Mutually exclusive with I(policy_json).
    type: str
  policy_json:
    description:
      - A properly json formatted policy as string.
      - Mutually exclusive with I(policy_document).
      - See U(https://github.com/ansible/ansible/issues/7005#issuecomment-42894813) on how to use it properly.
    type: json
  state:
    description:
      - Whether to create or delete the IAM policy.
    required: true
    choices: [ "present", "absent"]
    default: present
    type: str
  skip_duplicates:
    description:
      - By default the module looks for any policies that match the document you pass in, if there is a match it will not make a new policy object with
        the same rules. You can override this by specifying false which would allow for two policy objects with different names but same rules.
    default: True