Move output to connection utils

Signed-off-by: Katarzyna Treder <katarzyna.treder@h-partners.com>

connection/utils/output.py

@@ -0,0 +1,22 @@
+#
+# Copyright(c) 2019-2021 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+
+class Output:
+    def __init__(self, output_out, output_err, return_code):
+        self.stdout = output_out.decode('utf-8', errors="ignore").rstrip() if \
+            type(output_out) == bytes else output_out
+        self.stderr = output_err.decode('utf-8', errors="ignore").rstrip() if \
+            type(output_err) == bytes else output_err
+        self.exit_code = return_code
+
+    def __str__(self):
+        return f"exit_code: {self.exit_code}\nstdout: {self.stdout}\nstderr: {self.stderr}"
+
+
+class CmdException(Exception):
+    def __init__(self, message: str, output: Output):
+        super().__init__(f"{message}\n{str(output)}")
+        self.output = output