SCM: getifaddrs modfications for better out of the box experience

SCM: getifaddrs modfications for better out of the box experience

socket cm will now walk list of interfaces and ignore loopback
and ignore IB devices, unless the IB netdev is the only device.
Works better in a heterogenous environment with a mix of net device.
Tested with br0, mic0, and mic0:ib netdev mixes.
Overriding with DAPL_SCM_NETDEV still works as is.

Signed-off-by: Patrick Mccormick <patrick.m.mccormick@intel.com>
Signed-off-by: Arlin Davis <arlin.r.davis@intel.com>