cryptsetup-generator: fix the kernel command line strategy for luks.uuid

If rd.luks.uuid or luks.uuid is specified on the kernel command, only
generate units for these UUIDs. Additionally use the information in
/etc/crypttab unless rd.luks.crypttab=0 or luks.crypttab=0 is specified.
manager: prevent segfault in manager_print_jobs_in_progress()
fstab-generator: parse_new_root_from_proc_cmdline() don't use "defaults"

Don't use "defaults" as default option string.

"defaults,<anyotheroption>" does not
even work for the mount unit mount options.