Implements following configure keys:

--disable-libcfs-cdebug - disable libcfs CDEBUG, CWARN - enabled by default
--enable-libcfs-trace - enable libcfs ENTRY/EXIT - disabled by default
--disable-libcfs-assert - disable libcfs LASSERT, LASSERTF - enabled by default

Cmd3 found that disabling all of this contributes to performance at the range of 10-15%. This is inspected many times. Lustre source code is checked by hands for possible side effects from disabling LASSERT, etc. If you have any problems with this - please let me know.