<!--- Verify first that your feature was not already discussed on GitHub -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Describe the new feature/improvement briefly below -->
Use case is for customers on air-gapped customers who want to take the tarball using a flash drive inside their network.
Currently that is not possible because cli does not keep the tarball after installing the collection.

##### ISSUE TYPE
- Feature Idea

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

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->

<!--- Paste example playbooks or commands between quotes below -->
```yaml

```

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

---
            roles:
            # Same as v1 format just under the roles key
            collections:
            - namespace.collection
            - name: namespace.collection
              version: version identifier, multiple identifiers are separated by ','
              source: the URL or a predefined source name that relates to C.GALAXY_SERVER_LIST
        :param requirements_file: The path to the requirements file.
        :param allow_old_format: Will fail if a v1 requirements file is found and this is set to False.
        :return: a dict containing roles and collections to found in the requirements file.
        """
        requirements = {
            'roles': [],
            'collections': [],
        }
        b_requirements_file = to_bytes(requirements_file, errors='surrogate_or_strict')
        if not os.path.exists(b_requirements_file):
            raise AnsibleError("The requirements file '%s' does not exist." % to_native(requirements_file))
        display.vvv("Reading requirement file at '%s'" % requirements_file)
        with open(b_requirements_file, 'rb') as req_obj:
            try:
                file_requirements = yaml.safe_load(req_obj)
            except YAMLError as err:
                raise AnsibleError(
                    "Failed to parse the requirements yml at '%s' with the following error:\n%s"
                    % (to_native(requirements_file), to_native(err)))
        if file_requirements is None:
            raise AnsibleError("No requirements found in file '%s'" % to_native(requirements_file))
        def parse_role_req(requirement):