Fix return values for Create and Get

[dann1]

Now returns

 ~/P/C/provisioning-engine   sr_return *  src/client  ./http_cli.rb get http://localhost:1337/serverless-runtimes/230 ../../tests/example_runtime_definition_minimal.json
{
  "SERVERLESS_RUNTIME": {
    "NAME": "nature_aafdcada-cfe8-4b8c-87ed-af42de44b81c",
    "ID": 240,
    "FAAS": {
      "FLAVOUR": "nature",
      "ENDPOINT": "http://localhost:1339",
      "VM_ID": "205",
      "STATE": "PENDING",
      "CPU": 0.1,
      "MEMORY": 64,
      "DISK_SIZE": 256
    },
    "SCHEDULING": {
    },
    "DEVICE_INFO": {
    },
    "SERVICE_ID": 239
  }
}

Other changes

• Fixed schema having wrong parameter types and missing parameters
• Tests updated
  • backported verbose logging from dev branch
  • run tests on dedicated test templates to avoid NIC lease problems