ash: support for && and || in [[ expr ]]; add testsuite checks

diff --git a/shell/ash_test/ash-vars/var_bash2.right b/shell/ash_test/ash-vars/var_bash2.right
new file mode 100644
index 0000000..acba5c6
--- /dev/null
+++ b/shell/ash_test/ash-vars/var_bash2.right
@@ -0,0 +1,10 @@
+abc123xcba123
+abx123dcba123
+abx123dxba123
+abcx23dcba123
+abcxxxdcbaxxx
+abx
+xba123
+abx23
+abc23dcba123
+abcdcba