CORD-1401 Don't overwrite existing keypair, CiaB PCU setup roles

Change-Id: Ia0fe60315ed09ba39634ed5c25e50e7bfd51d1ab
diff --git a/roles/maas-user-privkey/defaults/main.yml b/roles/maas-user-privkey/defaults/main.yml
new file mode 100644
index 0000000..a87005c
--- /dev/null
+++ b/roles/maas-user-privkey/defaults/main.yml
@@ -0,0 +1,5 @@
+---
+# roles/maas-user-privkey/defaults/main.yml
+
+maas_homedir: "/var/lib/maas"
+pub_ssh_key_file_location: "{{ pub_ssh_key_location | default ('/etc/maas/.ssh') }}"