JSocket: Updated JSocket::connect()

To allow connect without explicit port number.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2282 ba6dc0ae-232f-0410-883f-9ebac64fc565
IB2TCP: New InfiniBand to TCP plugin.

- Should be loaded before infiniband plugin.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2283 ba6dc0ae-232f-0410-883f-9ebac64fc565
Added --ib2tcp flag to autoload ib2tcp plugin.

Will automatically load infiniband plugin.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2284 ba6dc0ae-232f-0410-883f-9ebac64fc565