Added zfs example playbook

examples/playbooks/zfs.yml

+---
+##
+# Example Ansible playbook that uses the Zfs module.
+#
+
+- hosts: webservers
+  gather_facts: no
+  sudo: yes
+
+  vars:
+    pool: rpool
+
+  tasks:
+
+  - name: Create a zfs file system
+    action: zfs name=$pool/var/log/httpd state=present 
+
+  - name: Create a zfs file system with quota of 10GiB and visible snapdir
+    action: zfs name=$pool/ansible quota='10G' snapdir=visible state=present
+
+  - name: Crate zfs snapshot of the above file system
+    action: zfs name=$pool/ansible@mysnapshot state=present 
+
+  - name: Create zfs volume named smallvol with a size of 10MiB
+    action: zfs name=$pool/smallvol volsize=10M state=present
+
+  - name: Removes snapshot of rpool/oldfs
+    action: zfs name=$pool/oldfs@oldsnapshot state=absent
+
+  - name: Removes file system rpool/oldfs
+    action: zfs name=$pool/oldfs state=absent