Better --check compatibility for ceph-common-coreos role

Carefully chosen "always_run: true" parameters for read-only tasks that
register variables. This enables --check runs (at least on deployed
clusters).

roles/ceph-common-coreos/tasks/install_pypy.yml

@@ -2,7 +2,7 @@
 - name: download python
   raw: cd $HOME &&  wget -O - {{coreos_pypy_url}} |tar -xjf -
 
-- name: create pypy_directory 
+- name: create pypy_directory
   raw: mkdir -p {{pypy_binary_directory}}
 
 - name: move pypy to pypy_install_directory

roles/ceph-common-coreos/tasks/main.yml

@@ -3,6 +3,7 @@
   raw: stat $HOME/.python
   register: need_python
   ignore_errors: true
+  always_run: true
 
 - include: install_pypy.yml
   when: need_python | failed
@@ -11,6 +12,7 @@
   raw: stat $HOME/.pip
   register: need_pip
   ignore_errors: true
+  always_run: true
 
 - include: install_pip.yml
   when: need_pip | failed and need_python | failed