Checkpoint new version of capture/tip that is sockets based instead
of pty/tty based (since they have several annoying problems associated). Note that permission is granted via the use of an "acl" file; /dev/tip/machine.acl, which must be set to the group of the project the node is in, so the user can read out the process id number and the random bits that are used by capture to grant permission to use (tip sends the random bits across first thing). This handshake is due to change to a request/challenge scheme as described by Dave in email to the testbed list.
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