Print distro name and version on startup

Now that we have kas containers with different distribution releases,
it's easy to get lost in selecting the desired one. The output should
help analyzing such cases but also the environment of a native
invocation.

Suggested-by: Felix Moessbauer <[email protected]>
Signed-off-by: Jan Kiszka <[email protected]>

Author: jan-kiszka

kas/kas.py

@@ -29,6 +29,7 @@
 
 import argparse
 import asyncio
+import distro
 import traceback
 import logging
 import signal
@@ -203,7 +204,8 @@ def kas(argv):
     if args.log_level:
         set_global_loglevel(args.log_level.upper())
 
-    logging.info('%s %s started', os.path.basename(sys.argv[0]), __version__)
+    logging.info('%s %s started on %s %s', os.path.basename(sys.argv[0]),
+                 __version__, distro.name(), distro.version())
 
     loop = asyncio.new_event_loop()
     asyncio.set_event_loop(loop)