yanglint FEATURE hints for option arguments

... and also completion if prefix is also specified.
diff --git a/tools/lint/tests/interactive/ly.tcl b/tools/lint/tests/interactive/ly.tcl
index 8386848..3fa2c82 100644
--- a/tools/lint/tests/interactive/ly.tcl
+++ b/tools/lint/tests/interactive/ly.tcl
@@ -165,7 +165,7 @@
     send -- "${input}\t"
     # expecting the hints, previous input from which the hints were generated
     # and some number of terminal control characters
-    expect -re "^\r\n${output}\r> ${prev_input}.*\r.*$"
+    expect -re "${output}\r> ${prev_input}.*\r.*$"
 }
 
 # Send 'exit' and wait for eof.