WIP: only one module is reformatted to serve as a demonstration.

The google format is documented here [0].

[0]: https://google.github.io/styleguide/pyguide.html

Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
---
 dts/framework/testbed_model/node.py | 171 +++++++++++++++++++---------
 1 file changed, 118 insertions(+), 53 deletions(-)

diff --git a/dts/framework/testbed_model/node.py b/dts/framework/testbed_model/node.py
index 23efa79c50..619743ebe7 100644
--- a/dts/framework/testbed_model/node.py
+++ b/dts/framework/testbed_model/node.py
@@ -3,8 +3,13 @@
 # Copyright(c) 2022-2023 PANTHEON.tech s.r.o.
 # Copyright(c) 2022-2023 University of New Hampshire

-"""
-A node is a generic host that DTS connects to and manages.
+"""Common functionality for node management.
+
+There's a base class, Node, that's supposed to be extended by other classes
+with functionality specific to that node type.
+The only part that can be used standalone is the Node.skip_setup static method,
+which is a decorator used to skip method execution if skip_setup is passed
+by the user on the cmdline or in an env variable.
 """

 from abc import ABC
@@ -35,10 +40,26 @@


 class Node(ABC):
-    """
-    Basic class for node management. This class implements methods that
-    manage a node, such as information gathering (of CPU/PCI/NIC) and
-    environment setup.
+    """The base class for node management.
+
+    It shouldn't be instantiated, but rather extended.
+    It implements common methods to manage any node:
+
+       * connection to the node
+       * information gathering of CPU
+       * hugepages setup
+
+    Arguments: