Move database classes and functions from kojihub.py to koji/db.py

Move QueryProcessor, InsertProcessor, UpdateProcessor,
BulkInsertProcessor, _applyQueryOpts, get_event, _dml,
_fetchMulti, _fetchSingle, _singleValue, _multiRow, _singleRow

Update koji-sweep-db script to DB Processors

Fixes: https://pagure.io/koji/issue/3466

plugins/hub/protonmsg.py

@@ -17,7 +17,8 @@ from proton.reactor import Container
 import koji
 from koji.context import context
 from koji.plugin import callback, convert_datetime, ignore_error
-from kojihub import QueryProcessor, InsertProcessor, get_build_type
+from kojihub import get_build_type
+from koji.db import QueryProcessor, InsertProcessor
 
 CONFIG_FILE = '/etc/koji-hub/plugins/protonmsg.conf'
 CONFIG = None

plugins/hub/sidetag_hub.py

@@ -4,12 +4,12 @@
 import sys
 
 import koji
-import koji.policy
+from koji.db import QueryProcessor, nextval
 from koji.context import context
 from koji.plugin import callback, export
+import koji.policy
 sys.path.insert(0, "/usr/share/koji-hub/")
 from kojihub import (  # noqa: E402
-    QueryProcessor,
     _create_build_target,
     _create_tag,
     _delete_build_target,
@@ -20,11 +20,11 @@ from kojihub import (  # noqa: E402
     get_build_target,
     get_tag,
     get_user,
-    nextval,
     policy_get_user,
     readInheritanceData,
 )
 
+
 CONFIG_FILE = "/etc/koji-hub/plugins/sidetag.conf"
 CONFIG = None
 ALLOWED_SUFFIXES = []