mail: adding capability to specify ehlo hostname (#3425)

* Adding capability to specify ehlo hostname

* Fixing default for ehlohost

the CI did not like "None" as default in the documentation,
judging from the rest of the definitions omitting that seems to be right

* Update plugins/modules/notification/mail.py

Proper spelling in documentation

Co-authored-by: Ajpantuso <ajpantuso@gmail.com>

* Adding Changelog Fragment

* Update changelogs/fragments/3425-mail_add_configurable_ehlo_hostname.yml

Proper phrasing in changelog

Co-authored-by: Ajpantuso <ajpantuso@gmail.com>

* integration-test for ehlohost parameter

* proper description, increased async-time

changed body of ehlohost-mail to reflect ehlohost
increased async from 30 to 45 as CI failed because
smtp was already down.

Co-authored-by: Ajpantuso <ajpantuso@gmail.com>

tests/integration/targets/mail/tasks/main.yml

@@ -26,7 +26,7 @@
 #        This would require either dumping the content, or registering async task output
 - name: Start test smtpserver
   shell: '{{ ansible_python.executable }} {{ remote_tmp_dir }}/smtpserver.py 10025:10465'
-  async: 30
+  async: 45
   poll: 0
   register: smtpserver
 
@@ -88,3 +88,13 @@
 - fail:
     msg: Send mail using TLS failed.
   when: smtpd_tls is succeeded and tls_support is failed and starttls_support is succeeded
+
+- name: Send a test-mail with body, specific recipient and specific ehlohost
+  mail:
+    port: 10025
+    ehlohost: some.domain.tld
+    from: ansible@localhost
+    to: root@localhost
+    subject: Test mail 6 (smtp + body + ehlohost)
+    body: Test body 6
+    secure: never