test-revert: move embedded script to its own file
Move the gen-revert-cases.py out of test-revert.t into its own file so
we can reuse it from other tests (specifically test-status-rev.t).
workingfilectx.date = (1000, 0)
ASCII : Gr?ezi!
Latin-1 : Gr�ezi!
UTF-8 : Grüezi!
<status modified=['foo'], added=[], removed=[], deleted=[], unknown=[], ignored=[], clean=[]>
diff --git a/foo b/foo
--- a/foo
+++ b/foo
@@ -1,1 +1,2 @@
foo
+bar