Remove Fedora from supported OS and add SLES 11

[skip ci]

doc/operation_guides/system_requirements.md

@@ -15,13 +15,14 @@ provide any official support for them.
 
 | Distribution (64 bits only)     | Identifier   | init system |
 | :------------------------------ | :----------- | :---------- |
-| Ubuntu 14.04 Trusty Tahr        | ubuntu-14.04 | upstart     |
-| Ubuntu 16.04 Xenial Xerus       | ubuntu-16.04 | upstart     |
-| Debian 8 Jessie                 | debian-8     | systemd     |
-| Debian 7 Wheezy                 | debian-7     | sysvinit    |
 | CentOS/RHEL 7.x                 | centos-7     | systemd     |
-| Fedora 20                       | fedora-20    | sysvinit    |
+| Debian 7 Wheezy                 | debian-7     | sysvinit    |
+| Debian 8 Jessie                 | debian-8     | systemd     |
+| Suse Linux Enterprise Server 11 | sles-11      | sysvinit    |
 | Suse Linux Enterprise Server 12 | sles-12      | sysvinit    |
+| Ubuntu 14.04 Trusty Tahr        | ubuntu-14.04 | upstart     |
+| Ubuntu 16.04 Xenial Xerus       | ubuntu-16.04 | upstart     |
+
 
 ### Dependencies