apps: rework portBindings

ports is REST API input . Map of env var to the host port
portBinding is the database structure. Map of env var to host port, count, type etc

also, rename portCount -> count in various places to keep things consistent

src/test/common.js

@@ -132,7 +132,7 @@ const app = {
     fqdn: domain.domain + '.' + 'applocation',
     manifest,
     containerId: 'someid',
-    portBindings: null,
+    portBindings: {},
     accessRestriction: null,
     memoryLimit: 0,
     mailboxDomain: domain.domain,
@@ -153,7 +153,7 @@ const proxyApp = {
     fqdn: domain.domain + '.' + 'proxylocation',
     manifest: proxyAppManifest,
     containerId: '',
-    portBindings: null,
+    portBindings: {},
     accessRestriction: null,
     memoryLimit: 0,
     mailboxDomain: domain.domain,