gce cloud provider breaks for make_master: True

[unthought]

Description of Issue/Question

GCE provider fails with Host for new master dev-saltmaster was not found, aborting.

Problem seems to be that the returned dict from create() isn't the what bootstrap-salt returns.

Setup

/etc/salt/cloud.profiles.d/dev-profiles.conf

base-dev:
  provider: gce

  # https://docs.saltstack.com/en/latest/topics/cloud/gce.html#ssh-remote-access
  # https://cloud.google.com/compute/docs/instances/adding-removing-ssh-keys#sshkeyformat
  ssh_username: salt-cloud
  ssh_keyfile: /etc/salt/pki/cloud/gce_ssh_keyfile
  metadata: '{"sshKeys": "salt-cloud:ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCg6UQw0k+kNy3zCV1Y8PQkxIy2IoUxBRjJ5HzQYxB7gorrX2/07dVhNWIfElBI6c4z+u0FSzawEyTDrrZv09rmDZ1e/A7PJR495DKXs5n/sKCOtivdKtBVSBUUYgpqCazUcTGixwTUMVwCN+kpOppZRghRN+91ldmfB9t+3P0PnfDri84+7EygvAaMmTRmWRiTePWCgpGqBpJWP/ewNj5W7E5rbITf5NE9UGlo4DySASiXAC7ipjxRjxqhfbHrW/9+Xs39mo+xSaq/JzOXG7nwWH8NhqlJwSlPvrjn4X5O0CTnJ8yP7t7kV8HonIKaFR3mCVS4ceIGqWsC+l0IT/3N salt-cloud"}'

  image: centos-7
  size: n1-standard-1
  location: southamerica-east1-a
  network: default
  subnetwork: default
  use_persistent_disk: True
  delete_boot_pd: False
  deploy: True
  make_master: False
  ssh_interface: public_ips
  external_ip: "ephemeral"

dev-saltmaster:
  extends: base-dev
  minion:
    grains:
      role: saltmaster
      env: dev
...

/etc/salt/cloud.maps.d/dev-environment.map

dev-saltmaster:
  - dev-saltmaster:
      make_master: True
...

Steps to Reproduce Issue

sudo salt-cloud -l all -m /etc/salt/cloud.maps.d/dev-environment.map

Versions Report

installation running salt-cloud:

Salt Version:
           Salt: 2017.7.2

Dependency Versions:
           cffi: Not Installed
       cherrypy: Not Installed
       dateutil: 2.4.2
      docker-py: Not Installed
          gitdb: 0.6.4
      gitpython: 1.0.1
          ioflo: Not Installed
         Jinja2: 2.8
        libgit2: Not Installed
        libnacl: Not Installed
       M2Crypto: Not Installed
           Mako: 1.0.3
   msgpack-pure: Not Installed
 msgpack-python: 0.4.6
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.12 (default, Nov 19 2016, 06:48:10)
   python-gnupg: Not Installed
         PyYAML: 3.11
          PyZMQ: 15.2.0
           RAET: Not Installed
          smmap: 0.9.0
        timelib: Not Installed
        Tornado: 4.2.1
            ZMQ: 4.1.4

System Versions:
           dist: Ubuntu 16.04 xenial
         locale: UTF-8
        machine: x86_64
        release: 4.4.0-92-generic
         system: Linux
        version: Ubuntu 16.04 xenial

newly provisioned master:

Salt Version:
           Salt: 2017.7.2

Dependency Versions:
           cffi: Not Installed
       cherrypy: Not Installed
       dateutil: Not Installed
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: Not Installed
         Jinja2: 2.7.2
        libgit2: Not Installed
        libnacl: Not Installed
       M2Crypto: Not Installed
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.4.8
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.5 (default, Aug  4 2017, 00:39:18)
   python-gnupg: Not Installed
         PyYAML: 3.11
          PyZMQ: 15.3.0
           RAET: Not Installed
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.2.1
            ZMQ: 4.1.4

System Versions:
           dist: centos 7.4.1708 Core
         locale: UTF-8
        machine: x86_64
        release: 3.10.0-693.2.2.el7.x86_64
         system: Linux
        version: CentOS Linux 7.4.1708 Core

[gtmanfred]

Thanks for the PR to fix this!
Daniel