LU-4022 hsm: Set agent_actions start index from -1

LU-4022 hsm: Set agent_actions start index from -1

aai_index was set to start from 0 which will cause the first entry
to be skipped. Set it to -1 instead.

Also take llog lock in proc_show() to avoid it from being changed
during the iteration.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: I09013dbf8a85d198496d8470746e773b388d9bee
Reviewed-on: http://review.whamcloud.com/7879
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Reviewed-by: Aurelien Degremont <aurelien.degremont@cea.fr>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>