renames: call hgutil.Abort from the correct module

Before this change, setting git.similarity to a value out of range would
result in a traceback because 'util' is hg-git's own module. Adds a test
demonstrating the fixed behavior.

hggit/git_handler.py

@@ -1547,7 +1547,7 @@ class GitHandler(object):
         # disabled by default to avoid surprises
         similarity = self.ui.configint('git', 'similarity', default=0)
         if similarity < 0 or similarity > 100:
-            raise util.Abort(_('git.similarity must be between 0 and 100'))
+            raise hgutil.Abort(_('git.similarity must be between 0 and 100'))
         if similarity == 0:
             return None
 

tests/test-renames.t

@@ -600,3 +600,9 @@ findcopiesharder finds copies from unmodified files if similarity is met
   +4
   +5
   +6
+
+Config values out of range
+  $ hg --config git.similarity=999 clone gitcopyharder hgcopyharder2
+  importing git objects into hg
+  abort: git.similarity must be between 0 and 100
+  [255]