Adds SUSE cloud storage repositories to crowbar admin node

IMHO this is slightly better style:

    if [ -n "$wantceph"] && [ -n "$want_sles12" ] && iscloudver 5plus; then
        add_suse_storage_repo
    fi

because:

* `&&` is intended (and normally used) for building lists (sequences of expressions/pipelines), not flow control
* separating conditionals from imperative code in the body brings greater clarity
* the value of `$?` can be non-zero even when there is no error
* consequently the script can exit unintentionally if `set -e` is enabled
* it increases the danger of that later on someone will get caught by the classic [`a && b || c` pitfall](http://mywiki.wooledge.org/BashPitfalls#cmd1_.26.26_cmd2_.7C.7C_cmd3)