<!--- 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 -->
If a user passes an incorrect username or password via the configuration for a galaxy_server the error message is unhelpful.

##### ISSUE TYPE
- Bug Report

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

<!--- Paste verbatim output from "ansible --version" between quotes -->
```
ansible --version
ansible 2.9.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /bin/ansible
  python version = 2.7.5 (default, Aug  7 2019, 00:51:29) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```
ansible-config dump --only-changed
DEFAULT_JINJA2_NATIVE(/etc/ansible/ansible.cfg) = True
GALAXY_SERVER_LIST(/etc/ansible/ansible.cfg) = [u'automation_hub']


```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
RHEL7

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

<!--- Paste example playbooks or commands between quotes below -->
```
[galaxy]
server_list = automation_hub
[galaxy_server.automation_hub]
url=https://cloud.redhat.com/api/automation-hub/
username=$INCORRECTUSERNAME
password=$PASSWORD

```

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

##### EXPECTED RESULTS
Actual error from automation hub api is exposed:
```
< HTTP/1.1 401 Unauthorized
< Server: openresty/1.13.6.1
< Content-Type: text/plain
< Content-Length: 40
< x-rh-insights-request-id: 
< X-Content-Type-Options: nosniff
< Date: Thu, 14 Nov 2019 18:05:51 GMT
< Connection: keep-alive
< Set-Cookie: ; path=/; HttpOnly; Secure
< X-Frame-Options: SAMEORIGIN
< 
```
Insights services authentication failed

<!--- Describe what you expected to happen when running the steps above -->


##### ACTUAL RESULTS
generic and not useful error is thrown:

```
ansible-galaxy collection install splunk.enterprise_security -vvv
ansible-galaxy 2.9.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /bin/ansible-galaxy
  python version = 2.7.5 (default, Aug  7 2019, 00:51:29) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]
Using /etc/ansible/ansible.cfg as config file
Process install dependency map
Processing requirement collection 'splunk.enterprise_security'
ERROR! Error when finding available api versions from automation_hub (https://cloud.redhat.com/api/automation-hub/) (HTTP Code: 401, Message: Unknown error returned by Galaxy server.)
```
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->

<!--- Paste verbatim command output between quotes -->
```paste below

```

data = collection_tar.read()
        boundary = '--------------------------%s' % uuid.uuid4().hex
        b_file_name = os.path.basename(b_collection_path)
        part_boundary = b"--" + to_bytes(boundary, errors='surrogate_or_strict')
        form = [
            part_boundary,
            b"Content-Disposition: form-data; name=\"sha256\"",
            to_bytes(secure_hash_s(data), errors='surrogate_or_strict'),
            part_boundary,
            b"Content-Disposition: file; name=\"file\"; filename=\"%s\"" % b_file_name,
            b"Content-Type: application/octet-stream",
            b"",
            data,
            b"%s--" % part_boundary,
        ]
        data = b"\r\n".join(form)
        headers = {
            'Content-type': 'multipart/form-data; boundary=%s' % boundary,
            'Content-length': len(data),
        }
        if 'v3' in self.available_api_versions:
            n_url = _urljoin(self.api_server, self.available_api_versions['v3'], 'artifacts', 'collections') + '/'
        else:
            n_url = _urljoin(self.api_server, self.available_api_versions['v2'], 'collections') + '/'
        resp = self._call_galaxy(n_url, args=data, headers=headers, method='POST', auth_required=True,
                                 error_context_msg='Error when publishing collection to %s (%s)'
                                                   % (self.name, self.api_server))
        return resp['task']
    @g_connect(['v2', 'v3'])
    def wait_import_task(self, task_id, timeout=0):