feat: add zfs modules (#225)

- add zfs_core module to puppetfile (provides zfs/zpool provider)
- add module to manage zfs

Reviewed-on: https://git.query.consul/unkinben/puppet-prod/pulls/225

modules/zfs/manifests/config.pp

@@ -0,0 +1,10 @@
+# manage zfs config
+class zfs::config {
+
+  file { $zfs::conf_dir:
+    ensure => directory,
+    owner  => 0,
+    group  => 0,
+    mode   => '0644',
+  }
+}