LU-8058 lustre: Remove old commented out code

These #if 0 blocks have been in place for years. Assume
they are not used and remove them

Cleanup functions that are no longer used:
sec_gss.c: gss_netobj_swabber
sec_gss.c: gss_swab_netobj
osd_iam_lvar.c: e_check
osd_iam.c: iam_leaf_check
osc_page.c: osc_page_is_dlocked
osc_page.c: osc_page_protected
mgs_llog.c: mgs_check_failnid

Test-Parameters: trivial

Signed-off-by: Ben Evans <bevans@cray.com>
Change-Id: Ib3d337f59a14c5cd7340be7e1aef4f2ca9663ac4
Reviewed-on: http://review.whamcloud.com/20416
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Frank Zago <fzago@cray.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>