bitbake: bitbake: cooker: don't stop file notifier when cooker is shutdown

It should be live/exited with server rather than cooker, fixed:
$ bitbake --server-only -T -1
Set MACHINE = "qemux86" in conf/local.conf
$ bitbake quilt
Set MACHINE = "qemuppc" in conf/local.conf
$ bitbake quilt
[snip]
ERROR: When reparsing /workspace1/lyang1/poky/meta/recipes-connectivity/openssl/openssl_1.0.2m.bb.do_package, the basehash value changed from c216f7f4fdd3cf4a0b10b975a636426c to d5a8e9431ab261381752d7a64c7b2fa9. The metadata is not deterministic and this needs to be fixed.
[snip]

This is because the server doesn't know local.conf is changed since the
notifiers are stopped, so it doesn't reparse, and then we would get the errors,
let the notifiers live/exited with server can fix the problem.

(Bitbake rev: a6a641cb9c5f3abe901b150da915372e295383d7)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/cooker.py

@@ -1604,8 +1604,6 @@ class BBCooker:
 
         if self.parser:
             self.parser.shutdown(clean=not force, force=force)
-        self.notifier.stop()
-        self.confignotifier.stop()
 
     def finishcommand(self):
         self.state = state.initial

bitbake/lib/bb/server/process.py

@@ -223,6 +223,8 @@ class ProcessServer(multiprocessing.Process):
 
         try: 
             self.cooker.shutdown(True)
+            self.cooker.notifier.stop()
+            self.cooker.confignotifier.stop()
         except:
             pass