undercloud-deploy: allow configuring inspection_extras and clean_nodes

This adds support for two variables:
* undercloud_clean_nodes - whether to enable ironic node cleaning
  (default is false).
* undercloud_inspection_extras - whether to use extended introspection,
  including LLDP and full inventory (default is true).

Change-Id: I0145b3731ee63b6b05f79706c9ec90a14c1b06e6

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

@@ -174,6 +174,12 @@ inspection_iprange = {{undercloud_inspection_iprange|default(
     '%s,%s' % (undercloud_network_cidr|nthhost(100),
     undercloud_network_cidr|nthhost(120)))}}
 
+# Whether to enable extra hardware collection during the inspection
+# process.
+{% if undercloud_inspection_extras is defined %}
+inspection_extras = {{undercloud_inspection_extras}}
+{% endif %}
+
 # Whether to run benchmarks when inspecting nodes. (boolean value)
 # Deprecated group/name - [DEFAULT]/discovery_runbench
 {% if undercloud_inspection_runbench is defined %}
@@ -291,6 +297,12 @@ templates = {{overcloud_templates_path}}
 enable_routed_networks = {{undercloud_enable_routed_networks}}
 {% endif %}
 
+# Whether to clean overcloud nodes (wipe the hard drive) between
+# deployments and after the introspection.
+{% if undercloud_clean_nodes is defined %}
+clean_nodes = {{undercloud_clean_nodes}}
+{% endif %}
+
 [auth]
 
 #