ash testsuite: add most of hust tests which pass for ash

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/ash_test/ash-misc/colon.tests b/shell/ash_test/ash-misc/colon.tests
new file mode 100755
index 0000000..cb8ab53
--- /dev/null
+++ b/shell/ash_test/ash-misc/colon.tests
@@ -0,0 +1,5 @@
+false
+:
+echo $?
+(while :; do exit; done)
+echo OK: $?