- removed duplicated LC_CONFIG_CDEBUG from lustre, renamed LC_CONFIG_CDEBUG in...

- removed duplicated LC_CONFIG_CDEBUG from lustre, renamed LC_CONFIG_CDEBUG in lnet to LN_CONFIG_CDEBUG - from Umka and Shadow;
- fixed deadlock in mdt_close() - patch from Mike;
- fixed unknown mode in mdt_open() - patch from Fanyong;
- fixed freeing of not allocated context in ptlrpc_main() - patch from Umka;
- fixed hanging in OST and further issues with module unloading - patch from Shadow;
- fixed hanging on umount with -f - patch from Shadow;