hush: add support for ':'; create testsuite entries

   text    data     bss     dec     hex filename
 809569     612    7044  817225   c7849 busybox_old
 809528     612    7044  817184   c7820 busybox_unstripped

diff --git a/shell/hush_test/hush-misc/colon.right b/shell/hush_test/hush-misc/colon.right
new file mode 100644
index 0000000..2a87d02
--- /dev/null
+++ b/shell/hush_test/hush-misc/colon.right
@@ -0,0 +1,2 @@
+0
+OK: 0