LU-8499 wireshark: fix packet-lustre so it compiles

LU-8499 wireshark: fix packet-lustre so it compiles

This patch removes a duplicate function definition for
lustre_dissect_struct_capa, and adds a definition for
ett_lustre_ladvise, which is referenced in
lustre_dissect_struct_lu_ladvise, but wasn't defined previously.

Test-Parameters: trivial

Signed-off-by: Kit Westneat <kit.westneat@gmail.com>
Change-Id: I700e2388175130d7274f4e3fac332cf069afbdcb
Reviewed-on: http://review.whamcloud.com/22074
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Amir Shehata <amir.shehata@intel.com>