Fix for oddities with ZFS bookmarks

The upcoming FreeBSD 10.1 release adds ZFS bookmarks.

While playing around with bookmarks, I noticed issues with "beadm list", e.g.:

    > beadm list
    BE                        Active Mountpoint  Space Created
    default                   -      -            4.9M 2014-09-22 20:51
    10.1-BETA3                -      -          109.2M 2014-09-28 18:54
    10.1-RC1                  NR     /            3.6G 2014-10-05 19:15
    zroot                     -      /            0.0K 2014-10-05 19:15
    10.1-BETA3#incbackup-last -      -            0.0K 2014-10-16 20:28
    10.1-RC1#incbackup-last   -      -            0.0K 2014-10-16 20:28
    default#incbackup-last    -      -            0.0K 2014-10-16 20:28

Contrast this to a properly behaving beadm:

    > ./beadm list
    BE         Active Mountpoint  Space Created
    default    -      -            4.9M 2014-09-22 20:51
    10.1-BETA3 -      -          109.2M 2014-09-28 18:54
    10.1-RC1   NR     /            3.6G 2014-10-05 19:15

The issue seems to stem from the use of the "-t all" option to "zfs list." In older versions of FreeBSD, "-t all" simply was equivalent to "-t filesystem,snapshot,volume." But now it includes bookmarks. My fix simply replaces occurrences of "-t all" with "-t filesystem,snapshot,volume." Arguably, only filesystem and snapshot are relevant to beadm, so the list can probably be reduced down to just those two.

This change would only affect "beadm list" and "beadm destroy." I don't believe the presence of bookmarks would affect "beadm destroy," but I thought it would be safer to replace "-t all" there anyway.