Modify mounting paths

When we create mounting paths for devices we have same paths if we create
them on 2 servers. For example for 2 servers and 2 volumes paths look like
this:
- /mnt/vdb
- /mnt/vdc
- /mnt/vdb
- /mnt/vdc
In this patch we add one more directory - id of server to this paths,
that when we have unique patch for each. After this patch paths will look
like this:
- /mnt/226575324/vdb
- /mnt/226575324/vdc
- /mnt/356104023/vdb
- /mnt/356104023/vdc

Change-Id: I7e4b2f68d987cd4d303915062984ce2125667db6
diff --git a/tempest/scenario/test_instances_with_cinder_volumes.py b/tempest/scenario/test_instances_with_cinder_volumes.py
index a907acd..b9ac2c8 100644
--- a/tempest/scenario/test_instances_with_cinder_volumes.py
+++ b/tempest/scenario/test_instances_with_cinder_volumes.py
@@ -181,21 +181,24 @@
                 server=server
             )
 
+            server_name = server['name'].split('-')[-1]
+
             # run write test on all volumes
             for volume in attached_volumes:
 
-                # get the mount path
-                dev_name = volume['attachments'][0]['device'][5:]
-
                 # dev name volume['attachments'][0]['device'][5:] is like
                 # /dev/vdb, we need to remove /dev/ -> first 5 chars
+                dev_name = volume['attachments'][0]['device'][5:]
+
+                mount_path = f"/mnt/{server_name}"
+
                 timestamp_before = self.create_timestamp(
                     ssh_ip, private_key=keypair['private_key'], server=server,
-                    dev_name=dev_name,
+                    dev_name=dev_name, mount_path=mount_path,
                 )
                 timestamp_after = self.get_timestamp(
                     ssh_ip, private_key=keypair['private_key'], server=server,
-                    dev_name=dev_name,
+                    dev_name=dev_name, mount_path=mount_path,
                 )
                 self.assertEqual(timestamp_before, timestamp_after)