<!--- 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 -->
We publish semver collection (vyos.vyos:0.0.1-dev58) to ansible galaxy, however by default it seems ansible-galaxy client will not be able to find it. You must specific the version number directly to fetch it.

https://galaxy.ansible.com/vyos/vyos


EDIT:

This is working as expect, but it would be nice to Include:

   --pre                       Include pre-release and development versions. By default, ansible-galaxy only finds stable versions.

##### 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 -->
```paste below
ansible 2.9.1
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below

```


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

<!--- Paste example playbooks or commands between quotes below -->
```yaml
$ ansible-galaxy collection install vyos.vyos -p /tmp/11123
[WARNING]: The specified collections path '/tmp/11123' is not part of the configured Ansible collections paths '/home/pabelanger/.ansible/collections:/usr/share/ansible/collections'. The
installed collection won't be picked up in an Ansible run.

Process install dependency map
ERROR! Cannot meet requirement * for dependency vyos.vyos from source 'https://galaxy.ansible.com/api/'. Available versions before last requirement added: 
Requirements from:
	base - 'vyos.vyos:*'
(venv) [pabelanger@localhost openstack]$ ansible-galaxy collection install vyos.vyos:0.0.1-dev57 -p /tmp/11123
[WARNING]: The specified collections path '/tmp/11123' is not part of the configured Ansible collections paths '/home/pabelanger/.ansible/collections:/usr/share/ansible/collections'. The
installed collection won't be picked up in an Ansible run.

Process install dependency map
Starting collection install process
Installing 'vyos.vyos:0.0.1-dev57' to '/tmp/11123/ansible_collections/vyos/vyos'
```

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

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
vyos.vyos collection to be found and installed

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

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

```

display.display("WARNING: More than one Galaxy role associated with Github repo %s/%s." % (github_user, github_repo),
                                color='yellow')
                display.display("The following Galaxy roles are being updated:" + u'\n', color=C.COLOR_CHANGED)
                for t in task:
                    display.display('%s.%s' % (t['summary_fields']['role']['namespace'], t['summary_fields']['role']['name']), color=C.COLOR_CHANGED)
                display.display(u'\nTo properly namespace this role, remove each of the above and re-import %s/%s from scratch' % (github_user, github_repo),
                                color=C.COLOR_CHANGED)
                return 0
            
            display.display("Successfully submitted import request %d" % task[0]['id'])
            if not context.CLIARGS['wait']:
                display.display("Role name: %s" % task[0]['summary_fields']['role']['name'])
                display.display("Repo: %s/%s" % (task[0]['github_user'], task[0]['github_repo']))
        if context.CLIARGS['check_status'] or context.CLIARGS['wait']:
            
            msg_list = []
            finished = False
            while not finished:
                task = self.api.get_import_task(task_id=task[0]['id'])
                for msg in task[0]['summary_fields']['task_messages']:
                    if msg['id'] not in msg_list:
                        display.display(msg['message_text'], color=colors[msg['message_type']])
                        msg_list.append(msg['id'])
                if task[0]['state'] in ['SUCCESS', 'FAILED']:
                    finished = True
                else:
                    time.sleep(10)
        return 0
    def execute_setup(self):