Add code 'ESC[c' into method 'strip_ansi_escape_codes'

Some 'MikroTik' devices add ANSI escape codes 'ESC[c' to the end
of the output when in 'safe-mode'

netmiko/base_connection.py

@@ -2361,7 +2361,8 @@ def strip_ansi_escape_codes(self, string_buffer: str) -> str:
         ESC[6n       Get cursor position
         ESC[1D       Move cursor position leftward by x characters (1 in this case)
         ESC[9999B    Move cursor down N-lines (very large value is attempt to move to the
-                     very bottom of the screen).
+                     very bottom of the screen)
+        ESC[c        Unknown code (added, for example, by MikroTik in 'Safe-Mode').
 
         HP ProCurve and Cisco SG300 require this (possible others).
 
@@ -2398,6 +2399,7 @@ def strip_ansi_escape_codes(self, string_buffer: str) -> str:
         code_cursor_down = chr(27) + r"\[\d*B"
         code_wrap_around = chr(27) + r"\[\?7h"
         code_bracketed_paste_mode = chr(27) + r"\[\?2004h"
+        code_unknown_0 = chr(27) + r"\[c"
 
         code_set = [
             code_position_cursor,
@@ -2428,6 +2430,7 @@ def strip_ansi_escape_codes(self, string_buffer: str) -> str:
             code_cursor_forward,
             code_wrap_around,
             code_bracketed_paste_mode,
+            code_unknown_0,
         ]
 
         output = string_buffer

tests/unit/test_base_connection.py

@@ -468,6 +468,7 @@ def test_strip_ansi_codes():
         "\x1b[J",  # code_erase_display
         "\x1b[0m",  # code_attrs_off
         "\x1b[7m",  # code_reverse
+        "\x1b[c",  # code_unknown_0
     ]
     for ansi_code in ansi_codes_to_strip:
         assert connection.strip_ansi_escape_codes(ansi_code) == ""