Create default network for more compute tests

Chipping away at the referenced bug, this commit uses the
create_default_network class-level variable introduced via [1] to
trigger setup_credentials to create a default network for
a handful more test cases in which the problem was observed.

[1] Ia34fe3b41261de02918713c2a948e6c56554bf6f
Partial-Bug: #1844568

Change-Id: Ic38c74c245fddf29826e6ca0cc469f919076355e

tempest/api/compute/servers/test_instance_actions.py

@@ -55,6 +55,7 @@ class InstanceActionsTestJSON(base.BaseV2ComputeTest):
 
 
 class InstanceActionsV221TestJSON(base.BaseV2ComputeTest):
+    create_default_network = True
 
     min_microversion = '2.21'
     max_microversion = 'latest'

tempest/api/compute/servers/test_server_password.py

@@ -19,6 +19,7 @@ from tempest.lib import decorators
 
 
 class ServerPasswordTestJSON(base.BaseV2ComputeTest):
+    create_default_network = True
 
     @classmethod
     def resource_setup(cls):

tempest/api/compute/volumes/test_attach_volume.py

@@ -28,6 +28,7 @@ CONF = config.CONF
 
 class BaseAttachVolumeTest(base.BaseV2ComputeTest):
     """Base class for the attach volume tests in this module."""
+    create_default_network = True
 
     @classmethod
     def skip_checks(cls):

tempest/api/compute/volumes/test_attach_volume_negative.py

@@ -21,6 +21,7 @@ CONF = config.CONF
 
 
 class AttachVolumeNegativeTest(base.BaseV2ComputeTest):
+    create_default_network = True
 
     @classmethod
     def skip_checks(cls):