PLT-2687 sending email on upgrade and moving profile pic to new location (#2808)

* Fixing CLI and adding unit tests

* Adding the upgrade_db_30 to the help text

* Adding the upgrade_db_30 to the help text

* Adding the upgrade_db_30 to the help text

* Fixing CLI tests

* PLT-2687 sending email on upgrade and moving profile pic to new location

* Fixing img move

* Fixing moving of profile image

* making upgrade email localizable

* Fixing email template

templates/email_footer.html

@@ -1,9 +1,6 @@
 {{define "email_footer"}}
 
 <td style="text-align: center;color: #AAA; font-size: 11px; padding-bottom: 10px;">
-    <p style="margin: 25px 0;">
-        <img width="65" src="{{.Props.SiteURL}}/static/images/circles.png" alt="">
-    </p>
     <p style="padding: 0 50px;">
         (c) 2015 Mattermost, Inc. 855 El Camino Real, 13A-168, Palo Alto, CA, 94301.<br>
         {{.Props.Footer}}