dapl/windows cma provider: add support for network devices based on index

dapl/windows cma provider: add support for network devices based on index

The linux cma provider provides support for named network devices, such
as 'ib0' or 'eth0'.  This allows the same dapl configuration file to
be used easily across a cluster.

To allow similar support on Windows, allow users to specify the device
name 'rdma_devN' in the dapl.conf file.  The given index, N, is map to a
corresponding IP address that is associated with an RDMA device.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>