reporting: fix incorrect converting of list based commands

The reporting module handled conversion between shell command
representations for the text and json reports incorrectly. The list of
strings representation was converted without preserving the argument
separation correctly which results in malformed commands in the text
report.

This patch utilizes the built-in shlex Python library for the conversion
which preserves the argument separation by wrapping arguments in quotes
when necessary.

Jira: RHEL-156521

Author: PeterMocary

leapp/reporting/__init__.py

@@ -1,16 +1,17 @@
 import datetime
-import json
 import hashlib
+import json
 import logging
 import os
+import shlex
 import six
 
 from leapp.compat import string_types
 # NOTE(pstodulk): the format_list is imported to provide the function
 # also in this library. Its use is not planned here however.
 from leapp.libraries.stdlib import format_list
 from leapp.libraries.stdlib.api import produce
-from leapp.models import fields, Model, ErrorModel
+from leapp.models import ErrorModel, Model, fields
 from leapp.topics import ReportTopic
 from leapp.utils.deprecation import deprecated
 
@@ -282,7 +283,7 @@ def __repr__(self):
         # NOTE(ivasilev) As the message can contain non-ascii characters let's deal with it properly.
         # As per python practices repr has to return an encoded string
         return "[{}] {}".format(self._value['type'],
-                                ' '.join([_guarantee_encoded_str(c) for c in self._value['context']]))
+                                shlex.join([_guarantee_encoded_str(c) for c in self._value['context']]))
 
 
 class RemediationHint(BaseRemediation):