<!--- 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

```

mock_display = MagicMock()
    monkeypatch.setattr(Display, 'display', mock_display)
    req = collection.CollectionRequirement('namespace', 'name', None, 'source', ['1.0.0'], '*', False, skip=True)
    req.install(None, None)
    assert mock_display.call_count == 1
    assert mock_display.mock_calls[0][1][0] == "Skipping 'namespace.name' as it is already installed"
def test_install_collection(collection_artifact, monkeypatch):
    mock_display = MagicMock()
    monkeypatch.setattr(Display, 'display', mock_display)
    collection_tar = collection_artifact[1]
    output_path = os.path.join(os.path.split(collection_tar)[0], b'output')
    collection_path = os.path.join(output_path, b'ansible_namespace', b'collection')
    os.makedirs(os.path.join(collection_path, b'delete_me'))  # Create a folder to verify the install cleans out the dir
    temp_path = os.path.join(os.path.split(collection_tar)[0], b'temp')
    os.makedirs(temp_path)
    req = collection.CollectionRequirement.from_tar(collection_tar, True, True)
    req.install(to_text(output_path), temp_path)
    # Ensure the temp directory is empty, nothing is left behind
    assert os.listdir(temp_path) == []
    actual_files = os.listdir(collection_path)
    actual_files.sort()
    assert actual_files == [b'FILES.json', b'MANIFEST.json', b'README.md', b'docs', b'playbooks', b'plugins', b'roles']
    assert mock_display.call_count == 1
    assert mock_display.mock_calls[0][1][0] == "Installing 'ansible_namespace.collection:0.1.0' to '%s'" \
        % to_text(collection_path)
def test_install_collection_with_download(galaxy_server, collection_artifact, monkeypatch):