btl tcp: Improve initialization debugging

When creating TCP BTL modules, print more information about the
module's ethernet association, including the first address associated
with the device, as debug output.

Fix a flipped output string for IPv4 and IPv6 addresses in the
modex send code.

Add the addresses being published in the modex to the debugging
output in modex send, to help match failures in endpoint match.

Signed-off-by: Brian Barrett <bbarrett@amazon.com>

opal/mca/btl/tcp/btl_tcp_component.c

@@ -564,10 +564,12 @@ static int mca_btl_tcp_create(int if_kindex, const char* if_name)
             }
         }
 
-#if 0 && OPAL_ENABLE_DEBUG
-        BTL_OUTPUT(("interface %s instance %i: bandwidth %d latency %d\n", if_name, i,
-                    btl->super.btl_bandwidth, btl->super.btl_latency));
-#endif
+        opal_output_verbose(5, opal_btl_base_framework.framework_output,
+                            "btl:tcp: %p: if %s kidx %d cnt %i addr %s %s bw %d lt %d\n",
+                            (void*)btl, if_name, (int) btl->tcp_ifkindex, i,
+                            opal_net_get_hostname((struct sockaddr*)&addr),
+                            (addr.ss_family == AF_INET) ? "IPv4" : "IPv6",
+                            btl->super.btl_bandwidth, btl->super.btl_latency);
     }
     return OPAL_SUCCESS;
 }
@@ -1154,7 +1156,8 @@ static int mca_btl_tcp_component_exchange(void)
 
                  opal_ifindextoname(index, ifn, sizeof(ifn));
                  opal_output_verbose(30, opal_btl_base_framework.framework_output,
-                                     "btl:tcp: examining interface %s", ifn);
+                                     "btl: tcp: component_exchange: examining interface %s",
+                                     ifn);
                  if (OPAL_SUCCESS !=
                      opal_ifindextoaddr(index, (struct sockaddr*) &my_ss,
                                         sizeof (my_ss))) {
@@ -1179,7 +1182,9 @@ static int mca_btl_tcp_component_exchange(void)
                          opal_ifindextokindex (index);
                      current_addr++;
                      opal_output_verbose(30, opal_btl_base_framework.framework_output,
-                                         "btl:tcp: using ipv4 interface %s", ifn);
+                                         "btl: tcp: component_exchange: "
+                                         "%s IPv6 %s", ifn,
+                                         opal_net_get_hostname((struct sockaddr*)&my_ss));
                  } else
 #endif
                  if ((AF_INET == my_ss.ss_family) &&
@@ -1196,7 +1201,9 @@ static int mca_btl_tcp_component_exchange(void)
                          opal_ifindextokindex (index);
                      current_addr++;
                      opal_output_verbose(30, opal_btl_base_framework.framework_output,
-                                         "btl:tcp: using ipv6 interface %s", ifn);
+                                         "btl: tcp: component_exchange: "
+                                         "%s IPv4 %s", ifn,
+                                         opal_net_get_hostname((struct sockaddr*)&my_ss));
                  }
              } /* end of for opal_ifbegin() */
          } /* end of for tcp_num_btls */