LU-17556 llite: removed dead branches

LU-17556 llite: removed dead branches

A few cases disabled branches:
   if (0 && ...

Code disabled for many years should be removed.

Fixes: 39f63cf54c6 ("LU-4476 kernel: support process namespace containers")
Fixes: 99727c7a1a4 ("LU-4017 quota: add setting/getting project id function")
Fixes: c3e10ade1ee ("Moved IAM code from ldiskfs to OSD.")
Test-Parameters: trivial
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I8f7ba09881d66845acea9fdf24f499fb7b5366fa
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54090
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>