Set default for ironic inspection network

prechecks won't pass without an ironic-inspection network defined.
However, this is currently unused, and really only useful for the
standalone ironic case, as we define the ironic provisioning,
cleaning, and inspection networks in neutron.

kolla/defaults.yml

@@ -157,6 +157,10 @@ ironic_provisioning_network_gateway: "{{ ironic_provisioning_network_cidr | ipad
 ironic_cleaning_network: "{{ ironic_provisioning_network }}"
 ironic_image_cache_size: 20480 # MB
 ironic_pxe_append_params: "nofb nomodeset vga=normal console=tty0 console=ttyS0,9600 systemd.journald.forward_to_console=yes rootpwd={{ ironic_pxe_root_password }}"
+
+# Defaults for inspection network, currently unused
+ironic_dnsmasq_dhcp_range: "10.52.0.10,10.52.0.200,255.255.255.0"
+
 #ironic_ks_services:
 #  - name: "ironic"
 #    type: "baremetal"