parallelize most system tests

bin/tests/system/coverage/tests.sh

@@ -24,11 +24,11 @@ matchall () {
     done
 }
 
-echo "I:checking for DNSSEC key coverage issues"
+echo_i "checking for DNSSEC key coverage issues"
 ret=0
 for dir in [0-9][0-9]-*; do
         ret=0
-        echo "I:$dir"
+        echo_i "$dir"
         args= warn= error= ok= retcode= match=
         . $dir/expect
         $COVERAGE $args -K $dir example.com > coverage.$n 2>&1
@@ -68,9 +68,9 @@ for dir in [0-9][0-9]-*; do
         fi
 
         n=`expr $n + 1`
-        if [ $ret != 0 ]; then echo "I:failed"; fi
+        if [ $ret != 0 ]; then echo_i "failed"; fi
         status=`expr $status + $ret`
 done
 
-echo "I:exit status: $status"
+echo_i "exit status: $status"
 [ $status -eq 0 ] || exit 1