tools: add report_v_module_folders_without_tests.v . Use it to discover other modules without _test.v files. Add simple ones, to ensure CI can find more breakage on future wide changes to vlib/

vlib/net/openssl/openssl_compiles_test.v

@@ -0,0 +1,6 @@
+import net.openssl
+
+fn test_openssl_compiles() {
+	assert openssl.is_used == 1
+	assert true
+}