<!--- 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.warning(u"- %s was NOT installed successfully: %s " % (role.name, to_text(e)))
                self.exit_without_ignore()
                continue
            
            if not no_deps and installed:
                if not role.metadata:
                    display.warning("Meta file %s is empty. Skipping dependencies." % role.path)
                else:
                    role_dependencies = role.metadata.get('dependencies') or []
                    for dep in role_dependencies:
                        display.debug('Installing dep %s' % dep)
                        dep_req = RoleRequirement()
                        dep_info = dep_req.role_yaml_parse(dep)
                        dep_role = GalaxyRole(self.galaxy, self.api, **dep_info)
                        if '.' not in dep_role.name and '.' not in dep_role.src and dep_role.scm is None:
                            
                            
                            continue
                        if dep_role.install_info is None:
                            if dep_role not in roles_left:
                                display.display('- adding dependency: %s' % to_text(dep_role))
                                roles_left.append(dep_role)
                            else:
                                display.display('- dependency %s already pending installation.' % dep_role.name)
                        else:
                            if dep_role.install_info['version'] != dep_role.version:
                                if force_deps:
                                    display.display('- changing dependant role %s from %s to %s' %
                                                    (dep_role.name, dep_role.install_info['version'], dep_role.version or "unspecified"))
                                    dep_role.remove()