bitbake: msg: use safe YAML loader

If using a YAML file in BB_LOGCONFIG, the unsafe loader is used and this
causes a runtime warning:

YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated,
as the default Loader is unsafe. Please read https://msg.pyyaml.org/load
for full details.

As log configuration YAML is relatively simple we can just use
safe_load().

(Bitbake rev: 71aaac9efa69abbf6c27d174e0862644cbf674ef)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/msg.py

@@ -278,7 +278,7 @@ def setLoggingConfig(defaultconfig, userconfigfile=None):
         with open(os.path.normpath(userconfigfile), 'r') as f:
             if userconfigfile.endswith('.yml') or userconfigfile.endswith('.yaml'):
                 import yaml
-                userconfig = yaml.load(f)
+                userconfig = yaml.safe_load(f)
             elif userconfigfile.endswith('.json') or userconfigfile.endswith('.cfg'):
                 import json
                 userconfig = json.load(f)