LU-15786 tests: get maxage param on mds1 properly

LU-15786 tests: get maxage param on mds1 properly

The correct maxage parameters on mds1:
  osp.${FSNAME}-MDT000[1-N]-osp-MDT0000.maxage

To reproduce the failure just run the following on
failover setup where mds1_HOST != mds1failover_HOST:
  sh llmount.sh
  ONLY="100b 100c" sh replay-single.sh

  error: get_param: param_path
   'osp/*MDT0000*MDT0001/maxage': No such file or directory
  sleep: missing operand
  Try 'sleep --help' for more information.

Fixes: 436cd4fd21 ("LU-14938 tests: fail_abort() in t-f to take care of MDTs")
Test-Parameters: trivial testlist=replay-single,recovery-small
Signed-off-by: Elena Gryaznova <elena.gryaznova@hpe.com>
HPE-bug-id: LUS-10804
Reviewed-by: Vladimir Saveliev <vlaidimir.saveliev@hpe.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Change-Id: Icbedb044c4a008868bd3a99d44aa1c350e7c9eaa
Reviewed-on: https://review.whamcloud.com/47145
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Vladimir Saveliev <vladimir.saveliev@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>