LU-5051 hsm: do not reallocate hsm receive buffer

LU-5051 hsm: do not reallocate hsm receive buffer

Instead of allocating 1MB for every call to
llapi_hsm_copytool_recv, allocate that buffer once in
llapi_hsm_copytool_register. The application must not call
llapi_hsm_copytool_recv until it has cleared the data from
the previous call, which lhsmtool_posix already does. This
also make llapi_hsm_action_list_free unnecessary.

Lustre-change: http://review.whamcloud.com/10299
Lustre-commit: 76dca841869d87df2b625cb9d186d531c406fc9b

Signed-off-by: Patrick Farrell <paf@cray.com>
Signed-off-by: Frank Zago <fzago@cray.com>
Change-Id: Ie9e15a5cb4e3ba6d3fe23d40ee2bb47330280abf
Reviewed-on: http://review.whamcloud.com/10299
Tested-by: Jenkins
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
(cherry picked from commit 76dca841869d87df2b625cb9d186d531c406fc9b)
Reviewed-on: http://review.whamcloud.com/10716
Tested-by: Oleg Drokin <oleg.drokin@intel.com>