EX-3889 lipe: lamigo error reporting and signal handling

EX-3889 lipe: lamigo error reporting and signal handling

Add new macros LAMIGO_{FATAL,ERROR,WARN,INFO,DEBUG}() to replace the
existing calls to llapi_error() and llapi_printf(). Replace almost all
open coded calls to exit() with LAMIGO_FATAL(). Handle signals
(SIGTERM, SIGUSR1, SIGUSR2) from a dedicated thread. Add
x{malloc,calloc,strdup}() macros that call LAMIGO_FATAL() on OOM
conditions. In main() replace the while (!stop) loop with a
non-breaking while (1) loop.

Test-Parameters: trivial testlist=hot-pools
Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: Idc31da6eca847305ca16b9992a7fb22aa4d0f112
Reviewed-on: https://review.whamcloud.com/45026
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Alexandre Ioffe <aioffe@ddn.com>
Reviewed-on: https://review.whamcloud.com/45210