Filter mainly finished, fix sth in lintener

This commit I make some changes:
- The filter got mainly finished.
  - Build a big node by the same tgid, and use the tgid node to
    build th tree we need by bfs.
  - Filt relative files, and for the files not closed, add close
    time stamp according to the exit time of their pids.
  - Put all the results into database.
Besides, I enlarge the buffer size of netlink connector and channels
in lintener.

TODO:
- the pivot_root syscall is used only by the initial shell(`docker
  start` makes a shell), other processes of shell change their root
  by changing namespace(mnt ns?), using setns syscall. So fix it.
- It's time to fix the netlink connector socket.

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