IB: Rename libinfiniband.so -> libdmtcp_infiniband.so

libinfiniband.so is kept as a symlink for backwards compatibility and
should be removed in future.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2279 ba6dc0ae-232f-0410-883f-9ebac64fc565
IB: Install libdmtcp_infiniband.so with make install.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2280 ba6dc0ae-232f-0410-883f-9ebac64fc565
IB: Added --ib flag to dmtcp_launch.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2281 ba6dc0ae-232f-0410-883f-9ebac64fc565