Add worker_id into TestReport

[KKoukiou]

I think this change is enough for the purpose of this issue
Though, I am not really familiar with the project, so please let me know if I am missing something.

[RonnyPfannschmidt]

good work

based on

pytest-xdist/xdist/slavemanage.py

Line 305 in dc646ce

elif eventname in (

and

pytest-xdist/xdist/slavemanage.py

Lines 325 to 329 in dc646ce

	def unserialize_report(name, reportdict):
	if name == "testreport":
	return runner.TestReport(**reportdict)
	elif name == "collectreport":
	return runner.CollectReport(**reportdict)

this change is good,
do you think you can add a test for it without too much effort ?

[nicoddemus]

Could you also add a new changelog entry and perhaps add a note to the README about this new feature?

[KKoukiou]

@RonnyPfannschmidt @nicoddemus thanks for the feedback. I 'll adjust the patch and resend with your comments!

[nicoddemus]

@RonnyPfannschmidt could you at least add a CHANGELOG entry?

[RonnyPfannschmidt]

@nicoddemus there is one already