Make test_tagged_attachment wait for SSHABLE

This test is failing very often, make it wait for the server being
started, this has helped for a lot of other volume related tests, too.

Signed-off-by: Dr. Jens Harbott <harbott@osism.tech>
Change-Id: Ic2b162b0cd4db04dd0f6c47de815e72888d04998
diff --git a/tempest/api/compute/servers/test_device_tagging.py b/tempest/api/compute/servers/test_device_tagging.py
index d099fce..7d29a4d 100644
--- a/tempest/api/compute/servers/test_device_tagging.py
+++ b/tempest/api/compute/servers/test_device_tagging.py
@@ -402,7 +402,7 @@
             config_drive=config_drive_enabled,
             name=data_utils.rand_name('device-tagging-server'),
             networks=[{'uuid': self.get_tenant_network()['id']}],
-            wait_until='ACTIVE')
+            wait_until='SSHABLE')
         self.addCleanup(self.delete_server, server['id'])
 
         # NOTE(mgoddard): Get detailed server to ensure addresses are present