LU-1199 lbuild: Fix error handling

LU-1199 lbuild: Fix error handling

Improper grouping of expressions in the error() function meant
that even a simple "lbuild -h" would trigger a backtrace, and email to
someone at whamcloud.com.  That is fixed here.

Also stop sending email to a static email address on errors.

Also fix a minor typo.

Change-Id: I5a3f6131baaadc9dba23414e9e959f72fbda2679
Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-on: http://review.whamcloud.com/5961
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Brian J. Murrell <brian.murrell@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>