Allow the addition of a "bastion" network to the admin node

If the network proposal contains a configuration of a bastion network as
e.g. documented in
https://github.com/crowbar/crowbar/wiki/Editing-the-network-json
automatically allocate an IP for the admin node in that network during
installation. This is helpful if you need to run the installation via ssh but
cannot use the admin network for that.

crowbar_framework/app/models/deployer_service.rb

@@ -112,8 +112,8 @@ def transition(inst, name, state)
 
       @logger.debug("Deployer transition: Done Allocate admin address for #{name} boot file:#{boot_ip_hex}")
 
-      # If we are the admin node, we may need to add a vlan bmc address.
       if node.admin?
+        # If we are the admin node, we may need to add a vlan bmc address.
         # Add the vlan bmc if the bmc network and the admin network are not the same.
         # not great to do it this way, but hey.
         admin_net = ProposalObject.find_data_bag_item "crowbar/admin_network"
@@ -124,6 +124,18 @@ def transition(inst, name, state)
           @logger.error("Failed to allocate bmc_vlan address for: #{node.name}: #{result[0]}") if result[0] != 200
           @logger.debug("Deployer transition: Done Allocate bmc_vlan address for #{name}")
         end
+
+        # Allocate the bastion network ip for the admin node if a bastion
+        # network is defined in the network proposal
+        bastion_net = ProposalObject.find_data_bag_item "crowbar/bastion_network"
+        unless bastion_net.nil?
+          result = ns.allocate_ip("default", "bastion", range, name)
+          if result[0] != 200
+            @logger.error("Failed to allocate bastion address for: #{node.name}: #{result[0]}")
+          else
+            @logger.debug("Allocated bastion address: #{result[1]["address"]} for the admin node.")
+          end
+        end
       end
 
       # Let it fly to the provisioner. Reload to get the address.