fi_info - some enums named, some are not

Add names to protocol and address format enums, and update fi_tostr to
use enumval.  removed now-unused "val32" from fi_tostr

Signed-off-by: Reese Faucette <rfaucett@cisco.com>

unless there is some reason these enums are treated differently, in  which case the size for "protocol" in fi_tostr still needs to be changed.  is currently treated as val64 but fi_ep_attr::protocol is uint32_t