[event log] Expose event keywords and publisher guid

Accessing the publisher guid is useful to setup an ETW trace, and we
need to know event keywords in order to activate the ETW session on the
correct "channels".

windows/winobject/event_log.py

@@ -443,6 +443,10 @@ class ChannelConfig(EvtHandle):
         "TEST"
         return [EvtPublisher(pub) for pub in chaninfo(self, gdef.EvtChannelPublisherList).value]
 
+    @property
+    def keywords(self):
+        return int(chaninfo(self, gdef.EvtChannelPublishingConfigKeywords).value)
+
     @property
     def enabled(self):
         return bool(chaninfo(self, gdef.EvtChannelConfigEnabled).value)
@@ -546,6 +550,15 @@ class PublisherMetadata(EvtHandle):
                 raise
         return sbuff.value
 
+    @property
+    def guid(self):
+        """The GUID associated with this provider
+
+        :type:  [:class:`GUID`] -- the GUID in a XXXXXXXXXX-YYYY-ZZZZ-TTTT-VVVVVVVVVV form
+        """
+        return publishinfo(self, gdef.EvtPublisherMetadataPublisherGuid).value
+
+
     def __repr__(self):
         return '<{0} "{1}">'.format(type(self).__name__, self.name)