Ensure use of "echo_i" where possible

In many instances 'echo "I:' construct was used where echo_i function
should have been.

bin/tests/system/inline/ns3/sign.sh

@@ -149,9 +149,9 @@ do
     rm -f $k1.private 
     mv $k1.key a-file
     $IMPORTKEY -P now -D now+3600 -f a-file $zone > /dev/null 2>&1 ||
-        ( echo "importkey failed: $alg" )
+        ( echo_i "importkey failed: $alg" )
     rm -f $k2.private 
     mv $k2.key a-file
     $IMPORTKEY -f a-file $zone > /dev/null 2>&1 ||
-        ( echo "importkey failed: $alg" )
+        ( echo_i "importkey failed: $alg" )
 done