LU-10350 tests: make parsing routines pattern aware

LU-10350 tests: make parsing routines pattern aware

'lfs getstripe' now returns the pattern for each component
of a directory and files. The routines that parse
parameters, parse_layout_param() and parse_plain_param(),
need to look for the component pattern when parsing the output
of 'lfs getstripe'.

Lustre-change: https://review.whamcloud.com/30636
Lustre-commit: 503a78bde8a59e176356a02b2d078332e3201575

Test-Parameters: trivial testlist=sanity-pfl,ost-pools
Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: Iab605f58e9c8f501fa0889806c511e3310cb6dd7
Reviewed-on: https://review.whamcloud.com/30636
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
(cherry picked from commit 503a78bde8a59e176356a02b2d078332e3201575)
Reviewed-on: https://review.whamcloud.com/32048
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>