<!--- 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 -->
The `ssh_opts` parameter relies on setting environment variables for git, such as GIT_SSH. Git did not recognize this environment variable until version 2.3.0 (see https://git-scm.com/docs/git/2.3.0), and many contemporary OSes (RHEL 7, CentOS7) include older versions of Git (1.8.3.1).

It would be useful to provide a warning in this case, similar to the warning for the `depth` parameter. E.g. "Your git version is too old to support the ssh_opts argument."

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
git.py
source control, git module

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
It would save users time when trying to troubleshoot failed git connections via SSH.

<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: clone a git repo
  git:
    repo: git@github.com:cherdt/hello_ansible.git
    dest: /opt/hello_ansible
    version: master
    ssh_opts: "{{-o IdentityFile=github_id_rsa}}"
```

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

"""return the installed version of git"""
    cmd = "%s --version" % git_path
    (rc, out, err) = module.run_command(cmd)
    if rc != 0:
        
        
        return None
    rematch = re.search('git version (.*)$', to_native(out))
    if not rematch:
        return None
    return LooseVersion(rematch.groups()[0])
def git_archive(git_path, module, dest, archive, archive_fmt, archive_prefix, version):
    """ Create git archive in given source directory """
    cmd = [git_path, 'archive', '--format', archive_fmt, '--output', archive, version]
    if archive_prefix is not None:
        cmd.insert(-1, '--prefix')
        cmd.insert(-1, archive_prefix)
    (rc, out, err) = module.run_command(cmd, cwd=dest)
    if rc != 0:
        module.fail_json(msg="Failed to perform archive operation",
                         details="Git archive command failed to create "
                                 "archive %s using %s directory."
                                 "Error: %s" % (archive, dest, err))
    return rc, out, err
def create_archive(git_path, module, dest, archive, archive_prefix, version, repo, result):