Increase zfs transaction timeout.

The goal here is to improve battery life by not waking up the CPU as often, but until I get the touchpad interrupt issue resolved, the difference won't be noticeable.

ansible/roles/zfs/files/increase_transaction_timeout_loader.conf

@@ -0,0 +1 @@
+vfs.zfs.txg.timeout=20

ansible/roles/zfs/tasks/freebsd.yaml

@@ -1,5 +1,9 @@
-# - name: Install packages
-#   package:
-#     name:
-#       - foo
-#     state: present
+- name: Install loader.conf
+  copy:
+    src: "files/{{ item }}_loader.conf"
+    dest: "/boot/loader.conf.d/{{ item }}.conf"
+    mode: 0644
+    owner: root
+    group: wheel
+  loop:
+    - increase_transaction_timeout