bitbake: bitbake: Drop older python version compatibility code

cooker: We can call multiprocessing close() unconditionally and tweak a
comment give 3.8 is now the minimum version.

lib/bb: We can drop the logger addition code only needed before 3.6

asyncrpc/hashserv: Since the minimum version is 3.8, we can drop the
conditional code.

(Bitbake rev: 16f4386400f88ba50605307961c248bef09895c1)

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

bitbake/lib/hashserv/tests.py

@@ -94,9 +94,6 @@ class HashEquivalenceTestSetup(object):
         return self.start_client(self.auth_server_address, user["username"], user["token"])
 
     def setUp(self):
-        if sys.version_info < (3, 5, 0):
-            self.skipTest('Python 3.5 or later required')
-
         self.temp_dir = tempfile.TemporaryDirectory(prefix='bb-hashserv')
         self.addCleanup(self.temp_dir.cleanup)