tools: ynl: move the cli and netlink code around

Move the CLI code out of samples/ and the library part
of it into tools/net/ynl/lib/. This way we can start
sharing some code with the code gen.

Initially I thought that code gen is too C-specific to
share anything but basic stuff like calculating values
for enums can easily be shared.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/cli.py

@@ -6,7 +6,7 @@ import json
 import pprint
 import time
 
-from ynl import YnlFamily
+from lib import YnlFamily
 
 
 def main():

tools/net/ynl/lib/__init__.py

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+from .ynl import YnlFamily
+
+__all__ = ["YnlFamily"]