[install-guide] do not synchronize Glance DB on openSUSE/SLES
[install-guide] do not synchronize Glance DB on openSUSE/SLES

It is not necessary to manually synchronize the Glance DB on
openSUSE/SLES because glance-manage db sync is part of the
init file.

Partial-Bug: 1422281
Backport: Juno

Change-Id: I178780225e24e7469527c6873facbeb22418080a

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