[RP] better keepalive.sh

[twb]

After some experience, I've changed my `gnome-session-lite' :)


keepalive: re-executes <FOO> whenever it dies.
        #!/bin/sh
        echo '----------------------------------------'
        echo "$0: executing $1 at `date -R`"
        $@; sleep 0.05; exec $0 $@

untilsuccess: re-executes <FOO> whenever it fail.
        #!/bin/sh
        echo '----------------------------------------'
        echo "$0: executing $1 at `date -R`"
        $@ || ( sleep 0.05; exec $0 $@ )

Now they print a note to stdout (good for logging), and there's a delay; stops 
it sucking *all* cycles.

HAND
trent