unregister terminal plugin in subprocesses before it gets configured

testing/test_remote.py

@@ -62,6 +62,7 @@ def test_remoteinitconfig(testdir):
     config1 = testdir.parseconfig()
     config2 = remote_initconfig(config1.option.__dict__, config1.args)
     assert config2.option.__dict__ == config1.option.__dict__
+    py.test.raises(KeyError, 'config2.pluginmanager.getplugin("terminal")')
 
 class TestReportSerialization:
     def test_itemreport_outcomes(self, testdir):

xdist/remote.py

@@ -104,6 +104,7 @@ def getinfodict():
 def remote_initconfig(option_dict, args):
     from pytest.plugin.config import Config
     config = Config()
+    config.pluginmanager.unregister(name="terminal")
     config._preparse(args, addopts=False)
     config.option.__dict__.update(option_dict)
     config.option.looponfail = False