Add support for novajoin in the undercloud

The novajoin service allows instances to register with a FreeIPA
server.

Depends-On: I2e1c18a0174f70dc6e9c1d402caac574e6c81678
Change-Id: I37b385f504f011b8b7f6a1d83a4a3852b01aae7e

roles/undercloud-deploy/templates/undercloud.conf.j2

@@ -185,6 +185,21 @@ enable_monitoring = {{undercloud_enable_monitoring}}
 #enable_monitoring = false
 {% endif %}
 
+# Whether to install novajoin metadata service in the Undercloud.
+{% if undercloud_enable_novajoin is defined %}
+enable_novajoin = {{undercloud_enable_novajoin}}
+{% else %}
+#enable_novajoin = false
+{% endif %}
+
+# One Time Password to register Undercloud node with IPA server.
+# Required when enable_novajoin = true.
+{% if undercloud_ipa_otp is defined %}
+ipa_otp = {{undercloud_ipa_otp}}
+{% else %}
+# ipa_otp =
+{% endif %}
+
 [auth]
 
 #