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For externally managed experiments, don't consider the current state of
the experiment.  If a node is reserved to the experiment, period, then its
entry needs to be disabled in dhcp.  Otherwise the next time dhcp_makeconf
runs, any already active externally managed experiments will revert to Emulab
dhcp.

Don't look it up for each and every node...

Also quiet down the EmulabFeatures library where we are using it
to detect external management.  Too many "checking for feature ..."
messages.

Leaving the node entries in the dhcpd.conf file, but setting them to
be ignored is better.  Cuts out "no free leases" log messages and is
less confusing for people looking through the config file.

Sprinkle a few comments around in dhcpd_makeconf

In support of the collaboration effort with CHPC, I've added a check
and actions for a new feature, ExternalNodeManagment.  When swapping in,
the swapper, group, and experiment are checked for the feature.  Since
there doesn't appear to be a way to ask for an experiment feature in the
parser, I'm punting for now and just letting the experiment inherit this
feature from the user and/or project/group.

The effect of this feature is that nodes will be omitted from the
dhcpd.conf file when allocated to a marked experiment, and put back
in when freed from that experiment.

We will also use this feature to force nodes to reboot even when they
are in PXEWAIT during the OS setup phase.  Ultimately the point is for
something else to take over the boot process and manage the experiment's
nodes for the duration of the experiment.

The mapping of old-school adX devices to new-school adaX names needs to
be fixed. I put an enumeration of the first 8 possibilities in there,
but it should be fixed in a more general way. Ideally by using the kernel's
message about "adaN: previously known as adM".

directory.

support code.

max renew time.

which puts the binaries in /use instead of /usr/local.

Also, sync up the various versions.

However, if CLIENT_BINDIR is not set, we default it to /usr/local/bin.

Little 'a' only removes mounts listed in /etc/fstab, which is none
given the way Emulab does NFS mounts. Big 'A' removes all mounted
filesystems of that type.