Revert "Add openSUSE support" (#2697)

README.md

@@ -52,7 +52,6 @@ Documents
 -   [Vagrant install](docs/vagrant.md)
 -   [CoreOS bootstrap](docs/coreos.md)
 -   [Debian Jessie setup](docs/debian.md)
--   [openSUSE setup](docs/opensuse.md)
 -   [Downloaded artifacts](docs/downloads.md)
 -   [Cloud providers](docs/cloud.md)
 -   [OpenStack](docs/openstack.md)
@@ -71,7 +70,6 @@ Supported Linux Distributions
 -   **Ubuntu** 16.04
 -   **CentOS/RHEL** 7
 -   **Fedora/CentOS** Atomic
--   **openSUSE** Leap 42.3/Tumbleweed
 
 Note: Upstart/SysV init based OS types are not supported.