Eliminate jinja2 template expression warning and rename coreos-python var (#1911)

* Change deprecated vagrant ansible flag 'sudo' to 'become'

* Emphasize, that the name of the pip_pyton_modules is only considered in coreos

* Remove useless unused variable

* Fix warning when jinja2 template-delimiters used in when statement

There is no need for jinja2 template-delimiters like {{ }} or {% %}
any more. They can just be omitted as described in https://github.com/ansible/ansible/issues/22397

* Fix broken link in getting-started guide

docs/getting-started.md

@@ -75,7 +75,7 @@ kube-apiserver via port 8080. A kubeconfig file is not necessary in this case,
 because kubectl will use http://localhost:8080 to connect. The kubeconfig files
 generated will point to localhost (on kube-masters) and kube-node hosts will
 connect either to a localhost nginx proxy or to a loadbalancer if configured.
-More details on this process are in the [HA guide](ha.md).
+More details on this process are in the [HA guide](ha-mode.md).
 
 Kubespray permits connecting to the cluster remotely on any IP of any 
 kube-master host on port 6443 by default. However, this requires 

roles/bootstrap-os/defaults/main.yml

@@ -1,5 +1,4 @@
 ---
-pypy_version: 2.4.0
-pip_python_modules:
+pip_python_coreos_modules:
   - httplib2
-  - six
+  - six

roles/bootstrap-os/tasks/bootstrap-coreos.yml

@@ -51,4 +51,4 @@
 - name: Install required python modules
   pip:
     name: "{{ item }}"
-  with_items: "{{pip_python_modules}}"
+  with_items: "{{pip_python_coreos_modules}}"

roles/bootstrap-os/tasks/bootstrap-debian.yml

@@ -16,7 +16,7 @@
     apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y python-minimal python-pip dbus
   when:
-    "{{ need_bootstrap.results | map(attribute='rc') | sort | last | bool }}"
+    need_bootstrap.results | map(attribute='rc') | sort | last | bool
 
 - set_fact:
     ansible_python_interpreter: "/usr/bin/python"