Add an additional way to dereference a variable in a playbook, $foo

(Using varReplace function originally from yum, thanks Seth)

test/playbook1.events

@@ -52,7 +52,7 @@
         [
             "task start", 
             [
-                "test basic shell", 
+                "test basic shell, plus two ways to dereference a variable", 
                 false
             ]
         ], 
@@ -61,10 +61,10 @@
             [
                 "127.0.0.1", 
                 {
-                    "cmd": "echo $HOME ", 
+                    "cmd": "echo $HOME 5150 5150 ", 
                     "rc": 0, 
                     "stderr": "", 
-                    "stdout": "/root"
+                    "stdout": "/root 5150 5150"
                 }
             ]
         ], 
@@ -200,4 +200,3 @@
         }
     }
 }
-

test/playbook1.yml

@@ -13,8 +13,8 @@
   - name: test basic success command 2
     action: command /bin/true
 
-  - name: test basic shell
-    action: shell echo $HOME
+  - name: test basic shell, plus two ways to dereference a variable
+    action: shell echo $HOME $port {{ port }}
 
 # in the command below, the test file should contain a valid template
 # and trigger the change handler