Davies Liu: refactor: move epoll/kqueue into mfscommon
Davie Liu: use epoll/kqueue in matocsserv
Davies Liu: bugfix: update maxtotalspace when cs register
Davies Liu: disable mmap: it will return -1 when failed, passert() will succeed
Davies Liu: bugfix: flush packet to fd (max)
Davies Liu: handle malloc failure
Davies Liu: fallback to poll when no epoll/kqueue
Davies Liu: typo
Davies Liu: rename fs_* to fs_log_* in mfsmetarestore
Davies Liu: chunk_multi_* -> chunk_log_multi_*
Davies Liu: export fs_log_* without METARESTORE
Davies Liu: add metalogger into mfsmaster
Davies Liu: enable mastercomm in mfsmaster when RUN_MODE != master
Davies Liu: export fs_log_*
Davies Liu: replay changelog from masterconn