Install Guide: openSUSE: Update keystone install
Install Guide: openSUSE: Update keystone install

With both openSUSE and SLES using systemd, we can merge instructions
- and merge with Fedora based distros as well.
Remove also now unneeded old openssl command.

Change-Id: Ia671a6122b49d7236c7511f04e652df9c69a7bf2

Akasurde/openstack-manuals,saeki-masaki/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,potsmaster/openstack-manuals,gongysh2004/openstack-manual,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,saeki-masaki/openstack-manuals,gongysh2004/openstack-manual,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,potsmaster/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,openstack/openstack-manuals