remove httpPort

we can just use container IP instead of all this httpPort exporting magic.
this is also required for exposing httpPaths feature (we have to otherwise
have multiple httpPorts).

src/test/updatechecker-test.js

@@ -233,7 +233,6 @@ describe('updatechecker - app - manual (email)', function () {
                 }
             }
         },
-        httpPort: null,
         containerId: null,
         portBindings: { PORT: 5678 },
         healthy: null,
@@ -342,7 +341,6 @@ describe('updatechecker - app - automatic (no email)', function () {
                 }
             }
         },
-        httpPort: null,
         containerId: null,
         portBindings: { PORT: 5678 },
         healthy: null,
@@ -407,7 +405,6 @@ describe('updatechecker - app - automatic free (email)', function () {
                 }
             }
         },
-        httpPort: null,
         containerId: null,
         portBindings: { PORT: 5678 },
         healthy: null,