ibacm: rework socket interface messages

ibacm: rework socket interface messages

Rather than indicating the src/dst address type in the acm message
header, indicate the type in the acm_ep_addr structure directly.
This adds more flexibility and will permit additional acm_ep_addr
structures to be carried in a single message request or response.

Allow multiple addresses in a request or response message.  This
is needed to support a wider range of fabric topologies, where the
inbound and outbound paths may differ, plus support failover.

Add path records to the resolve message, rather than as a separate
operation.  Return path records directly from the lookup.

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