LU-6609 test: wait for import state FULL

LU-6609 test: wait for import state FULL

recovery-small 26a sometimes couldn't remove sub-test dirs.
Decrement of export number may be caused by net issues.
So, now test is passed only when import state becomes EVICTED.
And in the end it waits for state FULL before removing sub-test dirs.

Test-Parameters: trivial envdefinitions=SLOW=yes,ONLY=26a testlist=recovery-small

Change-Id: Ib6156f4761bc79d89b42654898b51cc86c2ef40a
Reviewed-on: http://es-gerrit.xyus.xyratex.com:8080/1277
Signed-off-by: Sergey Cheremencev <Sergey_Cheremencev@xyratex.com>
Xyratex-bug-id: MRP-1168
Tested-by: Jenkins
Tested-by: Elena Gryaznova <elena_gryaznova@xyratex.com>
Reviewed-by: Alexey Lyashkov <alexey_lyashkov@xyratex.com>
Reviewed-by: Andrew Perepechko <andrew_perepechko@xyratex.com>
Reviewed-by: Vitaly Fertman <vitaly_fertman@xyratex.com>
Reviewed-on: https://review.whamcloud.com/14843
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Alexey Lyashkov <c17817@cray.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>