bitbake: prserv/serv: Shut down any existing server before restarting

This allows for cleaner code in cooker as any existing server is dealt
with before a new one is started.

(Bitbake rev: b8616931bc0e523a3a3bb23b4f623f8b6e71d690)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/prserv/serv.py

@@ -442,6 +442,9 @@ class PRServiceConfigError(Exception):
 def auto_start(d):
     global singleton
 
+    # Shutdown any existing PR Server
+    auto_shutdown()
+
     host_params = list(filter(None, (d.getVar('PRSERV_HOST') or '').split(':')))
     if not host_params:
         return None