[multipath] use -ll for path checker and prio inclusion

The 'multipath -l' command, per the man page, shows the topology as
'fetched in sysfs and the device mapper' and 'multipath -ll' shows
the topology from 'all available information'.  The '-ll' option,
among other things, includes useful items such as prio values and
path checkers, without adding much more verbosity.  For example,
prio value ommission seen below:

  |-+- policy='service-time 0' prio=0 status=active
  | |- 2:0:1:2   sdh  8:112  active undef unknown
  | `- 5:0:1:2   sdal 66:80  active undef unknown
  `-+- policy='service-time 0' prio=0 status=enabled
    |- 2:0:0:2   sdc  8:32   active undef unknown
    `- 5:0:0:2   sdag 66:0   active undef unknown

  |-+- policy='service-time 0' prio=50 status=active
  | |- 2:0:1:2   sdh  8:112  active ready running
  | `- 5:0:1:2   sdal 66:80  active ready running
  `-+- policy='service-time 0' prio=10 status=enabled
    |- 2:0:0:2   sdc  8:32   active ready running
    `- 5:0:0:2   sdag 66:0   active ready running

Gather 'multipath -ll' instead of 'multipath -l' as the additional
information adds value without additional verbosity.

Signed-off-by: John Pittman <jpittman@redhat.com>

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