tests: Wait after removing a BSS

When a BSS is removed, the flow continues without actually
waiting for the AP to be stopped. This is racy in flows that
actually expect the AP to be stopped, e.g., test_ap_bss_add_remove().

Try to mitigate such cases by adding a short sleep after the
AP is removed.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>

tests/hwsim/hostapd.py

@@ -766,6 +766,9 @@ def remove_bss(apdev, ifname=None):
     hapd_global = HostapdGlobal(apdev)
     hapd_global.remove(ifname)
 
+    # wait little to make sure the AP stops beaconing
+    time.sleep(0.1)
+
 def terminate(apdev):
     try:
         hostname = apdev['hostname']