refactor ansible code in to ansible-2.0 folder, and created space for ansible-2.10

ansible-2.0/roles/devtools/vars/_extravars.yml

@@ -0,0 +1,10 @@
+---
+# vars/_extravars.yml
+# define extra variable values here
+# this file should be loaded via an include_vars statement in the task.
+# often this is used for managing differences in os.
+
+# Variable setup.
+#- name: Include OS-Specific variables
+#  include_vars: "{{ ansible_os_family }}.yml"
+