rename location to subdomain

the primary subdomain was previously called 'location'. but the alias/secondary/redirect
subdomain is called 'subdomain'. this makes it all consistent.

location terminology is now used for { subdomain, domain } pair

src/test/common.js

@@ -96,7 +96,7 @@ const app = {
     appStoreId: 'appStoreId',
     installationState: apps.ISTATE_PENDING_INSTALL,
     runState: 'running',
-    location: 'applocation',
+    subdomain: 'applocation',
     domain: domain.domain,
     fqdn: domain.domain + '.' + 'applocation',
     manifest,
@@ -181,7 +181,7 @@ function setup(done) {
             const result = await users.createOwner(admin.email, admin.username, admin.password, admin.displayName, auditSource);
             admin.id = result;
         },
-        apps.add.bind(null, app.id, app.appStoreId, app.manifest, app.location, app.domain, app.portBindings, app),
+        apps.add.bind(null, app.id, app.appStoreId, app.manifest, app.subdomain, app.domain, app.portBindings, app),
         settings._set.bind(null, settings.CLOUDRON_TOKEN_KEY, exports.appstoreToken), // appstore token
         async function createUser() {
             const result = await users.add(user.email, user, auditSource);