Fix openstack image deletion with newer sdk

Openstacksdk version 0.103.0 removed an informal API we were using
which accepted an abbreviated dictionary as input to the delete_image
method.

It now requires either a complete image object or just a name_or_id,
so we now pass in the id.

The sdk min version is increased since older versions have not been
tested with this.

Change-Id: I7df276ab76e9b8fc17612853b474fec414dae977

nodepool/driver/openstack/provider.py

@@ -220,7 +220,7 @@ class OpenStackProvider(Provider, QuotaSupport):
         if name in self._images:
             del self._images[name]
 
-        return self._client.delete_image(dict(id=id))
+        return self._client.delete_image(id)
 
     def createServer(self, name, image,
                      flavor_name=None, min_ram=None,

requirements.txt

@@ -6,13 +6,10 @@ python-daemon>=2.0.4
 extras
 statsd>=3.0
 PrettyTable>=0.6,<0.8
-# openstacksdk before 0.27.0 is TaskManager based
-# 0.28.0-0.31.0 fail to upload images with glance tasks.
-# 0.31.1 and 0.31.2 have a bug with image deletion in tasks API
 # 0.99.0 - 0.102 lead to BadRequestException: Client Error [...] Bad networks format
 # This was due to not properly handling nova api microversions properly. 0.103
 # fixes this.
-openstacksdk>=0.27.0,!=0.28.0,!=0.29.0,!=0.30.0,!=0.31.0,!=0.31.1,!=0.31.2,!=0.99,!=0.100,!=0.101,!=0.102
+openstacksdk>=0.103.0
 diskimage-builder>=3.23.1
 voluptuous
 kazoo>=2.8.0