A warning is raised by PyYAML 5.3.1 on Debian about not specifying the
loader.
Make CLI output nice by removing the warning.
Test on CentOS and Debian by patching helm_shell.py.
Story: 2009966
Task: 45470
Signed-off-by: Dan Voiculeasa <dan.voiculeasa@windriver.com>
Change-Id: I31961d8d68207c1b568a361ca7a99f2aa103d9f8