Fix the prechecks for the ansible version

Change-Id: I7005a7ce15fa91df2c1e54569a80d7085e99e24e
Partial-Implements: blueprint ansible2

.gitignore

@@ -44,7 +44,7 @@ dev/vagrant/storage/
 releasenotes/build
 
 # Files generated by Ansible
-ansible/site.retry
+ansible/*.retry
 
 # Others
 .DS_Store

ansible/roles/prechecks/tasks/package_checks.yml

@@ -10,7 +10,7 @@
   local_action: command ansible --version
   register: result
   changed_when: false
-  failed_when: result.stdout | regex_replace('ansible (\\d+\\.\\d+\\.\\d+)', '\\1') | version_compare(ansible_version_max, '>=')
+  failed_when: result.stdout | regex_replace('ansible (\\d+\\.\\d+\\.\\d+)', '\\1') | version_compare(ansible_version_min, '<')
 
 # If this fails run "apt-get install linux-image-generic-lts-wily"
 - name: Checking LTS wily kernel version 4.2 on Ubuntu 14.04

ansible/roles/prechecks/vars/main.yml

@@ -1,4 +1,4 @@
 docker_version_min: '1.10.0'
 docker_py_version_min: '1.6.0'
-ansible_version_max: '2.0.0'
+ansible_version_min: '2.0.0'
 ubuntu_kernel_version_min: '4.2'