Merge branch 'f-ssl-warning-stderr' into 'dev'

ENH: Print "insecure ssl" warning to stderr.

See merge request caosdb/caosdb-pylib!9

src/caosdb/connection/connection.py

@@ -172,7 +172,7 @@ class _DefaultCaosDBServerConnection(CaosDBServerConnection):
             print("*** Warning! ***\n"
                   "Insecure SSL mode, certificate will not be checked! "
                   "Please consider removing the `ssl_insecure` configuration option.\n"
-                  "****************")
+                  "****************", file=sys.stderr)
             context.verify_mode = ssl.CERT_NONE
 
         if (not context.verify_mode == ssl.CERT_NONE and