Refactor stream log output to a utility.

lib/util/streamutil.js

@@ -43,7 +43,6 @@ module.exports.readAll = function(stream) {
   })
 }
 
-
 module.exports.findLine = function(stream, re) {
   var resolver = Promise.defer()
     , piped = stream.pipe(split())
@@ -73,3 +72,13 @@ module.exports.findLine = function(stream, re) {
     stream.unpipe(piped)
   })
 }
+
+module.exports.talk = function(log, format, stream) {
+  stream.pipe(split())
+    .on('data', function(chunk) {
+      var line = chunk.toString().trim()
+      if (line.length) {
+        log.info(format, line)
+      }
+    })
+}