server_test: add wait after terminate

In server_test started_imageio fixture
creates servers with built ovirt-imageio,
and terminates the process at the end,
between runs.

However, if runs do happen too fast
it may try to create the next server socket
before the previous is closed, resulting in
an "address already in use" error.

Add a wait() after terminate() to ensure we do
not run into such issue.

Fixes: e6ed821
Signed-off-by: Albert Esteve <[email protected]>

test/server_test.py

@@ -231,6 +231,7 @@ def started_imageio(tmpdir, drop_privileges="true"):
         yield proc
     finally:
         proc.terminate()
+        proc.wait()
 
 
 def user_groups(user):