plugin cleanups

* make pytest_eventlog.py work again by adding a hack to the registry, rename
* disable resultdb hook plugin, it needs merging with resultlog
* add some docstrings, streamline bits

--HG--
branch : trunk

py/test/plugin/pytest_monkeypatch.py

@@ -1,17 +1,15 @@
-import os
 """
-    provides the "monkeypatch" funcarg for safely patching objects, 
+    "monkeypatch" funcarg for safely patching objects, 
     dictionaries and environment variables during the execution of 
-    a test.  There are three helper functions: 
+    a test.  "monkeypatch" has three helper functions: 
 
         monkeypatch.setattr(obj, name, value) 
         monkeypatch.setitem(obj, name, value) 
         monkeypatch.setenv(name, value) 
 
-    After the test run all such modifications will be undone, 
-    which may even mean deleting the attribute or dictionary entry 
-    if it didn't exist before. 
+    After the test has run modifications will be undone. 
 """
+import os
 
 def pytest_funcarg__monkeypatch(request):
     monkeypatch = MonkeyPatch()