Replace usages of py.log by custom implementation (#822)

Co-authored-by: Bruno Oliveira <nicoddemus@gmail.com>

src/xdist/scheduler/load.py

@@ -1,8 +1,8 @@
 from itertools import cycle
 
-from py.log import Producer
 from _pytest.runner import CollectReport
 
+from xdist.remote import Producer
 from xdist.workermanage import parse_spec_config
 from xdist.report import report_collection_diff