kubeadm support (#1631)

* kubeadm support

* move k8s master to a subtask
* disable k8s secrets when using kubeadm
* fix etcd cert serial var
* move simple auth users to master role
* make a kubeadm-specific env file for kubelet
* add non-ha CI job

* change ci boolean vars to json format

* fixup

* Update create-gce.yml

* Update create-gce.yml

* Update create-gce.yml

roles/kubernetes/preinstall/vars/centos.yml

@@ -2,3 +2,4 @@
 required_pkgs:
   - libselinux-python
   - device-mapper-libs
+  - ebtables

roles/kubernetes/preinstall/vars/debian.yml

@@ -4,3 +4,4 @@ required_pkgs:
   - aufs-tools
   - apt-transport-https
   - software-properties-common
+  - ebtables

roles/kubernetes/preinstall/vars/fedora.yml

@@ -2,3 +2,4 @@
 required_pkgs:
   - libselinux-python
   - device-mapper-libs
+  - ebtables

roles/kubernetes/preinstall/vars/redhat.yml

@@ -2,3 +2,4 @@
 required_pkgs:
   - libselinux-python
   - device-mapper-libs
+  - ebtables

roles/kubernetes/preinstall/vars/ubuntu.yml

@@ -0,0 +1,7 @@
+---
+required_pkgs:
+  - python-apt
+  - aufs-tools
+  - apt-transport-https
+  - software-properties-common
+  - ebtables