ucm: modify IB address format to align better with sockaddr_in6

ucm: modify IB address format to align better with sockaddr_in6

Restructure the dcm_addr union to map the IB side
closer to sockaddr6 and initialize family to
AF_INET6 to insure callee allocates enough memory
for ucm dat_ia_address type. Put qpn in flowinfo
and gid in sin6_addr. Change the test suites
to print address information based on AF_INET
or AF_INET6 instead of using specific IB address
union from the provider.

Signed-off-by: Arlin Davis <arlin.r.davis@intel.com>