revset: rename 'revsnode' to 'inputrev' in ancestors

revset: rename 'revsnode' to 'inputrev' in ancestors

We usually use 'node' for variable containing 20 bytes hash. There is nothing
nodish in this variable, so we rename it to "inputrev" as it old the next entry
of the iteration.

--- a/mercurial/revset.py	Mon May 04 12:36:48 2015 -0700
+++ b/mercurial/revset.py	Wed Mar 26 16:14:30 2014 -0700
@@ -25,23 +25,23 @@
     cl = repo.changelog
 
     def iterate():
-        revqueue, revsnode = None, None
+        revqueue, inputrev = None, None
         h = []
 
         revs.sort(reverse=True)
         revqueue = util.deque(revs)
         if revqueue:
-            revsnode = revqueue.popleft()
-            heapq.heappush(h, -revsnode)
+            inputrev = revqueue.popleft()
+            heapq.heappush(h, -inputrev)
 
         seen = set()
         while h:
             current = -heapq.heappop(h)
             if current not in seen:
-                if revsnode and current == revsnode:
+                if inputrev and current == inputrev:
                     if revqueue:
-                        revsnode = revqueue.popleft()
-                        heapq.heappush(h, -revsnode)
+                        inputrev = revqueue.popleft()
+                        heapq.heappush(h, -inputrev)
                 seen.add(current)
                 yield current
                 for parent in cl.parentrevs(current)[:cut]: