bitbake: prserv/persist_data/utils: Drop obsolete python2 imports

These imports were from python 2.6 and earlier, 2.4 in some cases.
Drop them since we're all python3 now.

(Bitbake rev: 7ef12684e8647b006bf46cae695069d4bfece1cf)

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

bitbake/lib/prserv/serv.py

@@ -5,12 +5,7 @@ import threading
 import queue
 import socket
 import io
-
-try:
-    import sqlite3
-except ImportError:
-    from pysqlite2 import dbapi2 as sqlite3
-
+import sqlite3
 import bb.server.xmlrpc
 import prserv
 import prserv.db