Remove hostname-format option

This option has not been used since at least the migratio to the
statemachine framework.

Change-Id: I7a0e928889f72606fcbba0c94c2d49fbb3ffe55f

doc/source/openstack.rst

@@ -45,7 +45,6 @@ Selecting the OpenStack driver adds the following options to the
           launch-timeout: 900
           launch-retries: 3
           image-name-format: '{image_name}-{timestamp}'
-          hostname-format: '{label.name}-{provider.name}-{node.id}'
           post-upload-hook: /usr/bin/custom-hook
           diskimages:
             - name: trusty
@@ -80,7 +79,6 @@ Selecting the OpenStack driver adds the following options to the
           region-name: 'region1'
           rate: 1.0
           image-name-format: '{image_name}-{timestamp}'
-          hostname-format: '{label.name}-{provider.name}-{node.id}'
           diskimages:
             - name: precise
               meta:
@@ -156,12 +154,6 @@ Selecting the OpenStack driver adds the following options to the
 
      The region name if the provider cloud has multiple regions.
 
-  .. attr:: hostname-format
-     :type: string
-     :default: {label.name}-{provider.name}-{node.id}
-
-     Hostname template to use for the spawned instance.
-
   .. attr:: image-name-format
      :type: string
      :default: {image_name}-{timestamp}

nodepool/driver/aws/config.py

@@ -344,7 +344,6 @@ class AwsProviderConfig(ProviderConfig):
             'profile-name': str,
             'cloud-images': [provider_cloud_images],
             'diskimages': [provider_diskimages],
-            'hostname-format': str,
             'boot-timeout': int,
             'launch-timeout': int,
             'launch-retries': int,

nodepool/driver/openstack/config.py

@@ -176,7 +176,6 @@ class OpenStackProviderConfig(ProviderConfig):
         self.port_cleanup_interval = None
         self.diskimages = {}
         self.cloud_images = {}
-        self.hostname_format = None
         self.image_name_format = None
         self.post_upload_hook = None
         super().__init__(provider)
@@ -214,10 +213,6 @@ class OpenStackProviderConfig(ProviderConfig):
             'port-cleanup-interval',
             600
         )
-        self.hostname_format = self.provider.get(
-            'hostname-format',
-            '{label.name}-{provider.name}-{node.id}'
-        )
         self.image_name_format = self.provider.get(
             'image-name-format',
             '{image_name}-{timestamp}'
@@ -348,7 +343,6 @@ class OpenStackProviderConfig(ProviderConfig):
             'launch-retries': int,
             'nodepool-id': str,
             'rate': v.Coerce(float),
-            'hostname-format': str,
             'image-name-format': str,
             'clean-floating-ips': bool,
             'port-cleanup-interval': int,

releasenotes/notes/hostname-format-b773f6d0e8dd1933.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    The hostname-format option, previously available for the OpenStack
+    and AWS drivers, but unused for some time, has been removed.
+    Remove any uses of it from nodepool config files before upgrading;
+    otherwise they will fail config validation.