[LU-4278] remove lwt code

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.6.0
• Affects Version/s: Lustre 2.6.0
• Labels: patch
• Assignee: Dmitry Eremin (Inactive)
• Reporter: Peng Tao

Description

All platforms have defined LWT_SUPPORT to 0. lwt.c is not even listed in Makefile.in. so it is indeed dead code for years and should be removed.