LU-9306 tests: more debug info for hsm test_24d

LU-9306 tests: more debug info for hsm test_24d

More debug information for sanity-hsm test_24d.
Drop unnecessary condition check for mdt_hsm_cdt_stop().

Test-Parameters: testlist=sanity-hsm,sanity-hsm,sanity-hsm,sanity-hsm
Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: Ib4a43693d364e208468937d15e3c48a1b1afb17a
Reviewed-on: https://review.whamcloud.com/26770
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>