test: ensure we echo prompt
Tool running using the shipped 'run-tests.py' instead of the mercurial one would
get different result otherwise.
--- a/tests/test-stabilize-conflict.t Mon Oct 13 11:09:35 2014 +0200
+++ b/tests/test-stabilize-conflict.t Mon Nov 17 16:04:48 2014 +0100
@@ -8,6 +8,7 @@
> [ui]
> interactive=false
> merge=internal:merge
+ > promptecho = True
> [defaults]
> amend=-d "0 0"
> [merge-tools]