rosparam YAMLLoadWarning

[mbuijs]

Recently I've been seeing the following warning when I run rosparam set from commandline.

$ rosparam set /use_sim_time true
/opt/ros/melodic/lib/python2.7/dist-packages/rosparam/__init__.py:370:
YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as
the default Loader is unsafe. Please read https://msg.pyyaml.org/load for
full details.
  set_param_raw(param, yaml.load(value), verbose=verbose)

As far as I could find this is related to the new release of pyyaml deprecating the use of yaml.load(..) as is described here: yaml/pyyaml#257

Good to note is that I have PyYAML version 5.1 installed in my user directory through pip, this won't happen when using pyyaml from the Ubuntu repositories, since that's currently still version 3.12.

[dirk-thomas]

Please consider to provide a pull request to use yaml.safe_load() instead.