[CloudFoundry] 突破每個User Memory 2G限制

1. 修改 ~/cloudfoundry/.deployments/rest/config/cloud_controller.yml

...
default_account_capacity:
  memory:   4096
  app_uris: 4
  services: 16
  apps:     20
...

2. Restart Cloudfoundry

 ~/cloudfoundry/vcap/dev_setup/bin/vcap_dev restart