Install Guide: Fix service names for Ubuntu and openSUSE
Install Guide: Fix service names for Ubuntu and openSUSE

For Ubuntu:
openvswitch->openvswitch-switch
neutron-openvswitch-agent->neutron-plugin-openvswitch-agent
For openSUSE:
neutron-openvswitch-agent->openstack-neutron-openvswitch-agent

Change-Id: I8fa175b9a666a41818c1fc590fc34a9afbb91e32
backport: havana
Closes-Bug: 1246021

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