LU-7403 llite: flatten struct lookup_intent

LU-7403 llite: flatten struct lookup_intent

Replace the union in struct lookup_intent with the members of struct
lustre_indent_data. Remove the then unused struct lustre_intent_data.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I47d815f7c8e51bcff33ea7dba6efbc08337ca509
Reviewed-on: http://review.whamcloud.com/17069
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>