Fix issue starting local registry with customports (#349)

.vscode/launch.json

@@ -5,20 +5,11 @@
             "name": "Python Module",
             "type": "python",
             "request": "launch",
-            "stopOnEntry": true,
             "module": "iotedgedev.cli",
             "args": [
-                "solution",
-                "new",
-                "test_solution"
+                "push"
             ],
-            "debugOptions": [
-                "RedirectOutput"
-            ],
-            "env": {
-                "DOTENV_FILE": ".env",
-            }
+            "cwd": "${workspaceFolder}/tests/test_solution"
         }
     ]
 }
-        

iotedgedev/dockercls.py

@@ -43,7 +43,7 @@ class Docker:
             raise ValueError("You must specific a port for your local registry server. Expected: 'localhost:5000'. Found: " + local_server)
 
         port = parts[1]
-        ports = {'{0}/tcp'.format(port): int(port)}
+        ports = {'5000/tcp': int(port)}
 
         try:
             self.output.info("Looking for local 'registry' container")