Implement Azure cloud provider scripts

Implement basic cloud provider functionality to deploy Kubernetes on
Azure.  SaltStack is used to deploy Kubernetes on top of Ubuntu
virtual machines.  OpenVpn provides network connectivity.  For
kubelet authentication, we use basic authentication (username and
password).  The scripts use the legacy Azure Service Management APIs.

We have set up a nightly test job in our Jenkins server for federated
testing to run the e2e test suite on Azure.  With the cloud provider
scripts in this commit, 14 e2e test cases pass in this environment.
We plan to implement additional Azure functionality to support more
test cases.

cluster/saltbase/salt/docker/init.sls

@@ -47,6 +47,93 @@ docker:
       - pkg: docker-io
 
 {% endif %}
+{% elif grains.cloud is defined and grains.cloud == 'azure-legacy' %}
+
+{% if pillar.get('is_systemd') %}
+
+{{ pillar.get('systemd_system_path') }}/docker.service:
+  file.managed:
+    - source: salt://docker/docker.service
+    - template: jinja
+    - user: root
+    - group: root
+    - mode: 644
+    - defaults:
+        environment_file: {{ environment_file }}
+
+# The docker service.running block below doesn't work reliably
+# Instead we run our script which e.g. does a systemd daemon-reload
+# But we keep the service block below, so it can be used by dependencies
+# TODO: Fix this
+fix-service-docker:
+  cmd.wait:
+    - name: /opt/kubernetes/helpers/services bounce docker
+    - watch:
+      - file: {{ pillar.get('systemd_system_path') }}/docker.service
+      - file: {{ environment_file }}
+{% endif %}
+
+{{ environment_file }}:
+  file.managed:
+    - source: salt://docker/docker-defaults
+    - template: jinja
+    - user: root
+    - group: root
+    - mode: 644
+    - makedirs: true
+    - require:
+      - pkg: docker-engine
+
+apt-key:
+  pkgrepo.managed:
+    - humanname: Dotdeb
+    - name: deb https://apt.dockerproject.org/repo ubuntu-trusty main
+    - dist: ubuntu-trusty
+    - file: /etc/apt/sources.list.d/docker.list
+    - keyid: 58118E89F3A912897C070ADBF76221572C52609D
+    - keyserver: hkp://p80.pool.sks-keyservers.net:80
+
+lxc-docker:
+  pkg:
+    - purged
+
+docker-io:
+  pkg:
+    - purged
+
+cbr0:
+  network.managed:
+    - enabled: True
+    - type: bridge
+{% if grains['roles'][0] == 'kubernetes-pool' %}
+    - proto: none
+{% else %}
+    - proto: dhcp
+{% endif %}
+    - ports: none
+    - bridge: cbr0
+{% if grains['roles'][0] == 'kubernetes-pool' %}
+    - ipaddr: {{ grains['cbr-cidr'] }}
+{% endif %}
+    - delay: 0
+    - bypassfirewall: True
+    - require_in:
+      - service: docker
+
+docker-engine:
+   pkg:
+     - installed
+     - require:
+       - pkgrepo: 'apt-key'
+
+docker:
+   service.running:
+     - enable: True
+     - require:
+       - file: {{ environment_file }}
+     - watch:
+       - file: {{ environment_file }}
+
 {% elif grains.cloud is defined and grains.cloud in ['vsphere', 'photon-controller'] and grains.os == 'Debian' and grains.osrelease_info[0] >=8 %}
 
 {% if pillar.get('is_systemd') %}
@@ -304,6 +391,7 @@ docker-upgrade:
     - name: /opt/kubernetes/helpers/pkg install-no-start {{ docker_pkg_name }} {{ override_docker_ver }} /var/cache/docker-install/{{ override_deb }}
     - require:
       - file: /var/cache/docker-install/{{ override_deb }}
+
 {% endif %} # end override_docker_ver != ''
 
 {% if pillar.get('is_systemd') %}