lsfd: show classes of anonyomous inodes in AINODECLASS column

lsfd: show classes of anonyomous inodes in AINODECLASS column

Below an example output:

    $ ./lsfd -oCOMMAND,PID,USER,ASSOC,TYPE,AINODECLASS -Q '(SOURCE == "anon_inodefs")' | head
    COMMAND             PID USER ASSOC TYPE AINODECLASS
    systemd            1360  jet     4 UNKN   eventpoll
    systemd            1360  jet     5 UNKN    signalfd
    systemd            1360  jet     6 UNKN     inotify
    systemd            1360  jet     8 UNKN     timerfd
    systemd            1360  jet     9 UNKN   eventpoll
    systemd            1360  jet    11 UNKN     inotify
    systemd            1360  jet    13 UNKN     inotify
    systemd            1360  jet    21 UNKN     timerfd
    gnome-keyring-d    4598  jet     5 UNKN     eventfd

Signed-off-by: Masatake YAMATO <yamato@redhat.com>