Change pool module to attempt to attach to nodes that are already running

[Kelly McLaughlin]

The pool module prints out an error message and takes no further action for
nodes that are already running. I think the behavior should be changed such
that if the return from slave:start/3 is {already_running, Node} then an
attempt to attach to the node is still made. This makes sense because the
node has been specified by the user in the .hosts.erlang file indicating a
wish for the node to be part of the pool and a manual attach can be
successfully made after the pool is started.

git fetch git://github.com/mclaughlin77/otp.git pool_connect_to_running_nodes



Kelly