yanglint TEST searchpath and path

The 'data' directory is intended for data (xml, json...), but there was
nowhere else to put the module for testing the 'path' parameter, and it
seemed pointless to me to create a new directory for one test.
diff --git a/tools/lint/tests/modules/modimp-path.yang b/tools/lint/tests/modules/modimp-path.yang
new file mode 100644
index 0000000..d9dbb9b
--- /dev/null
+++ b/tools/lint/tests/modules/modimp-path.yang
@@ -0,0 +1,8 @@
+module modimp-path {
+  namespace "urn:yanglint:modimp-path";
+  prefix ip;
+
+  import modpath {
+    prefix mp;
+  }
+}