msh: create testsuite (based on hush one)
hush: add TODO (doesn't know ":" command)

diff --git a/shell/msh_test/msh-execution/nested_break.right b/shell/msh_test/msh-execution/nested_break.right
new file mode 100644
index 0000000..4e8b6b0
--- /dev/null
+++ b/shell/msh_test/msh-execution/nested_break.right
@@ -0,0 +1,8 @@
+A
+B
+iteration
+C
+A
+B
+iteration
+D