Build Basic Install Guide for openSUSE

The Basic Install Guide has now information for openSUSE
(see https://review.openstack.org/#/c/41777/) and thus
it should be build and published as well like the other
Basic Install Guides.

Currently this works only on the master branch.

Change-Id: I7e29de435f75c3bc9f2288f646e6895dc0646b74
Merge "Build Basic Install Guide for openSUSE"