LU-969 debug: reduce stack usage

LU-969 debug: reduce stack usage

1, libcfs_debug_vmsg2 to accept libcfs_debug_msg_data struture
   to replace SUBSYSTEM, __FILE__, __FUNCTION__, __LINE__ and
   cdls on the stack

2, CDEBUG, DEBUG_CAPA use static libcfs_debug_msg_data

3, remove the local variable in RETURN/GOTO/__CHECK_STACK

4, reduce stack in recovery thread by moving lu_env,
   ptlrpc_thread to heap.

Updated patch to include all 2.3 fixes. (lu1436 and 1408)

Change-Id: I42437a35d428546beadf656602ede9c12c8bd2fd
Signed-off-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/3623
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>