LU-11474 lnet: unlink md if fail to send recovery

LU-11474 lnet: unlink md if fail to send recovery

MD for recovery ping should be unlinked if we fail to send the GET.

Test-Parameters: trivial
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: Iac84ceda886f47df1b1a1d734129c8d29851886b
Reviewed-on: https://review.whamcloud.com/33306
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Sonia Sharma <sharmaso@whamcloud.com>
Reviewed-by: Doug Oucharek <dougso@me.com>
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>