rebase: on abort delete rebase state file no matter what

When a user's repository is in an unfinished rebase state and they choose to
abort, at a minimum, the repo should be out of that state. We've found
situations where the user could not leave the state unless manually deleting the
rebasestate file. This fix ensures that no matter what exception may be raised
during the abort, the rebase state file will be deleted, the user will be out of
the rebase state and they can get their repository into a workable condition.

hgext/rebase.py

@@ -926,6 +926,7 def abort(repo, originalwd, target, stat
     activebookmark: the name of the bookmark that should be active after the
         restore'''
 
+    try:
     # If the first commits in the rebased set get skipped during the rebase,
     # their values within the state mapping will be the target rev id. The
     # dstates list must must not contain the target rev (issue4896)
@@ -954,13 +955,15 def abort(repo, originalwd, target, stat
         # Strip from the first rebased revision
         rebased = filter(lambda x: x >= 0 and x != target, state.values())
         if rebased:
-            strippoints = [c.node()  for c in repo.set('roots(%ld)', rebased)]
+                strippoints = [
+                        c.node()  for c in repo.set('roots(%ld)', rebased)]
             # no backup of rebased cset versions needed
             repair.strip(repo.ui, repo, strippoints)
 
     if activebookmark and activebookmark in repo._bookmarks:
         bookmarks.activate(repo, activebookmark)
 
+    finally:
     clearstatus(repo)
     repo.ui.warn(_('rebase aborted\n'))
     return 0