Tidy up messages; ensure errors to to stderr

weaver/weave

@@ -129,7 +129,7 @@ configure_container_networking() {
             (ip netns exec $NSPID ip link set $GUEST_IFNAME name $CONTAINER_IFNAME &&
             ip netns exec $NSPID ip addr add $2 dev $CONTAINER_IFNAME &&
             ip netns exec $NSPID ip link set $CONTAINER_IFNAME up &&
-            check_command_and_run ethtool ip netns exec $NSPID ethtool -K $3 tx off) > $IP_TMPFILE 2>&1 &&
+            check_command_and_run ethtool ip netns exec $NSPID ethtool -K $3 tx off > /dev/null) > $IP_TMPFILE 2>&1 &&
             EXITCODE=0
         else
             # failed before we assigned the veth to the container's namespace - delete it
@@ -139,10 +139,10 @@ configure_container_networking() {
 
     if [ "$EXITCODE" -ne 0 ] ; then
         if ! ps -p $DOCKERPID > /dev/null 2>&1 ; then
-            echo "Container died during network set-up. ID $1" >&2
+            echo "Container $1 died" >&2
         else
             echo "Failure during network set-up:" >&2
-            cat $IP_TMPFILE
+            cat $IP_TMPFILE >&2
         fi
     fi