Use root logger for Karapace startup info line printing

The `print` function uses buffered `stdout` and it may get printed after
shutdown. Use logger instead to print the startup line in correct place
during startup.

Alternative the `print' function could use argument `flush=True`.

karapace/karapace_all.py

@@ -43,7 +43,8 @@ def main() -> int:
         print("Both rest and registry options are disabled, exiting")
         return 1
 
-    print("=" * 100 + f"\nStarting {info_str}\n" + "=" * 100)
+    info_str_separator = "=" * 100
+    logging.log(logging.INFO, "\n%s\nStarting %s\n%s", info_str_separator, info_str, info_str_separator)
 
     try:
         kc.run(host=kc.config["host"], port=kc.config["port"])