LU-2675 libcfs: ignore CDEBUG_ENTRY_EXIT for userspace

LU-2675 libcfs: ignore CDEBUG_ENTRY_EXIT for userspace

In userspace define GOTO() and RETURN() to not call libcfs_log_goto()
or libcfs_log_return(). Remove the definition of uses of the obsolete
__arch_lib__ symbol.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I55411d57e0cb00e3e742b011317244b452c23f6a
Reviewed-on: http://review.whamcloud.com/12281
Tested-by: Jenkins
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>