Fix Garderos GRS alt_prompt (#3733)

Unprivilged prompts on GRS terminate with a `$`.

Tested with Garderos version 3.7.38, 3.6.68 and 3.5.66

Co-authored-by: Marco Pfatschbacher <[email protected]>
Co-authored-by: Kirk Byers <[email protected]>

Author: 3 people

netmiko/garderos/garderos_grs.py

@@ -18,7 +18,7 @@ def session_preparation(self) -> None:
         """Prepare the session after the connection has been established"""
         self.ansi_escape_codes = True
         self._test_channel_read()
-        self.set_base_prompt(pri_prompt_terminator="#")
+        self.set_base_prompt(pri_prompt_terminator="#", alt_prompt_terminator="$")
         self.clear_buffer()
 
     def send_command(