LU-7469 test: add missing init to lustre-rsync-test:test_1a

LU-7469 test: add missing init to lustre-rsync-test:test_1a

Target directory was not created for first time, so failed to write to
target location.

Seagate-bug-id: MRP-2382
Signed-off-by: Hema Yarramilli <hema.yarramilli@seagate.com>
Change-Id: I1192c413c8c173abdea3929dbaec19f1f5d20c92
Reviewed-on: http://review.whamcloud.com/17355
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Saurabh Tandan <saurabh.tandan@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>