LU-15342 tests: escape "|"

LU-15342 tests: escape "|"

escape "|" on want="FULL|IDLE" to protect interpretation
by shell:
  sh: IDLE: command not found

Fixes: af666bef05 ("LU-12857 tests: allow clients to be IDLE after recovery")
Test-Parameters: trivial
Signed-off-by: Elena Gryaznova <elena.gryaznova@hpe.com>
Change-Id: I2f885ea225ba43537f37b8dad1c2e0cd8f652a79
Reviewed-on: https://review.whamcloud.com/45788
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Vladimir Saveliev <vlaidimir.saveliev@hpe.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>