core: osinfo properties - added 3.5 values

As 3.5 cluster version has been recently introduced,
appropriate values should be manually added explicitly
(similar to: Ib4b2d3b3eb14d368814392cfcb63e6c8648d05cc).

Note:
This should be a temporary solution until implementation
of cluster versions inheritance in OsInfo infrastructure;
covered by: https://bugzilla.redhat.com/show_bug.cgi?id=1056577.

Change-Id: I82acba49f080e9250481b0a62ac66817091a1755
Signed-off-by: Daniel Erez <derez@redhat.com>