curtin:xenial:amd64 Install custom kernel

  * MAAS does not give any possibility to install
    custom kernel version, via node definition
  * Add possilibility to define:
    - exact kernel version
    - few extra pkgs, to be installed during
      curtin stage
  Warning: in that case, global maas variable
    'maas_config:default_min|max_*_kernel:' will
    be ignored at all.

Change-Id: I89f4f656c5e02e1cb10d6a81905b4abd7d738d40
Closes-Bug: PROD-25084 (PROD:25084)
diff --git a/tests/pillar/maas_region.sls b/tests/pillar/maas_region.sls
index a150389..d601e91 100644
--- a/tests/pillar/maas_region.sls
+++ b/tests/pillar/maas_region.sls
@@ -6,6 +6,13 @@
       port: 80
     role: master
     enable_iframe: True
+    cluster:
+      curtin_vars:
+        amd64:
+          xenial:
+            extra_pkgs: [ "curl", "wget" ]
+            #kernel_package: 'linux-image-virtual-hwe-16.04'
+            kernel_package: 'mc'
   region:
     enabled: true
     bind: