Removing escape sequence from output in cmd_output function!

In console outputs we are getting escape sequences because
of which most of the testcases are failing to use the output
of few commands. This PR removes the escape sequence first
then use the output.This PR fixes multiple testcases.

Signed-off-by: Anushree Mathur <anushree.mathur@linux.vnet.ibm.com>

aexpect/client.py

@@ -259,7 +259,8 @@ def _get_aexpect_helper(self, helper_cmd, pass_fds, echo, command):
             full_output += output
             sub_status = sub.poll()
             if sub_status is not None:
-                raise ExpectProcessTerminatedError(pattern, sub_status, full_output)
+                raise ExpectProcessTerminatedError(
+                    pattern, sub_status, full_output)
         else:
             raise ExpectTimeoutError(pattern, full_output)
         return sub
@@ -1188,7 +1189,7 @@ def read_up_to_prompt(self, timeout=60.0, internal_timeout=None,
                                                  print_func)[1]
 
     def cmd_output(self, cmd, timeout=60, internal_timeout=None,
-                   print_func=None, safe=False):
+                   print_func=None, safe=False, strip_console_codes=False):
         """
         Send a command and return its output.
 
@@ -1203,15 +1204,19 @@ def cmd_output(self, cmd, timeout=60, internal_timeout=None,
                 error messages that make read_up_to_prompt to timeout. Let's
                 try to be a little more robust and send a carriage return, to
                 see if we can get to the prompt when safe=True.
-
+        :param strip_console_codes: Whether remove the escape sequence from the output 
+                In serial session there are escape sequences present,if it is not
+                expected while reading the output remove it by passing 
+                serial_console_codes = True
         :return: The output of cmd
         :raise ShellTimeoutError: Raised if timeout expires
         :raise ShellProcessTerminatedError: Raised if the shell process
                 terminates while waiting for output
         :raise ShellError: Raised if an unknown error occurs
+
         """
         if safe:
-            return self.cmd_output_safe(cmd, timeout)
+            return self.cmd_output_safe(cmd, timeout, strip_console_codes)
         session_tag = f"[{self.output_prefix}] " if self.output_prefix else ""
         LOG.debug("%sSending command: %s", session_tag, cmd)
         self.read_nonblocking(0, timeout)
@@ -1223,16 +1228,22 @@ def cmd_output(self, cmd, timeout=60, internal_timeout=None,
             raise ShellTimeoutError(cmd, output) from error
         except ExpectProcessTerminatedError as error:
             output = self.remove_command_echo(error.output, cmd)
-            raise ShellProcessTerminatedError(cmd, error.status, output) from error
+            raise ShellProcessTerminatedError(
+                cmd, error.status, output) from error
         except ExpectError as error:
             output = self.remove_command_echo(error.output, cmd)
             raise ShellError(cmd, output) from error
 
         # Remove the echoed command and the final shell prompt
+        if strip_console_codes:
+            # Removing the escape sequence
+            output_no_escape = astring.strip_console_codes(out)
+            return self.remove_last_nonempty_line(self.remove_command_echo(output_no_escape,
+                                                                           cmd))
         return self.remove_last_nonempty_line(self.remove_command_echo(out,
                                                                        cmd))
 
-    def cmd_output_safe(self, cmd, timeout=60):
+    def cmd_output_safe(self, cmd, timeout=60, strip_console_codes=False):
         """
         Send a command and return its output (serial sessions).
 
@@ -1244,6 +1255,10 @@ def cmd_output_safe(self, cmd, timeout=60):
         :param cmd: Command to send (must not contain newline characters)
         :param timeout: The duration (in seconds) to wait for the prompt to
                 return
+        :param strip_console_codes: Whether remove the escape sequence from the output 
+                In serial session there are escape sequences present,if it is not
+                expected while reading the output remove it by passing 
+                serial_console_codes = True
 
         :return: The output of cmd
         :raise ShellTimeoutError: Raised if timeout expires
@@ -1278,6 +1293,11 @@ def cmd_output_safe(self, cmd, timeout=60):
             raise ShellTimeoutError(cmd, out)
 
         # Remove the echoed command and the final shell prompt
+        if strip_console_codes:
+            # Removing the escape sequence
+            output_no_escape = astring.strip_console_codes(out)
+            return self.remove_last_nonempty_line(self.remove_command_echo(output_no_escape,
+                                                                           cmd))
         return self.remove_last_nonempty_line(self.remove_command_echo(out,
                                                                        cmd))