LU-15724 tests: MDT failover hang reproducer

LU-15724 tests: MDT failover hang reproducer

The patch adds recovery-small 144a test to reproduce
MDT failover hang when precreate threads are blocked on objects.

LustreError: 0-0: Forced cleanup waiting for mdt-kjcf05-MDT0001_UUID
namespace with 46 resources in use, (rc=-110)

Lustre-change: https://review.whamcloud.com/47006
Lustre-commit: aa6250b7412e7baf6760fe4010a81f4f22187127

Test-Parameters: trivial testlist=recovery-small env=ONLY=144a
HPE-bug-id: LUS-10750
Signed-off-by: Alexander Boyko <alexander.boyko@hpe.com>
Change-Id: I2743a1b5c8911d6982b527f7e7b7bbbaf310cd04
Reviewed-by: Alexey Lyashkov <alexey.lyashkov@hpe.com>
Reviewed-by: Sergey Cheremencev <sergey.cheremencev@hpe.com>
Reviewed-on: https://review.whamcloud.com/48550
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>