utils/misc: Move load_struct_from_yaml() from WA to devlib

This is copied from WA (workload-automation/wa/utils/misc.py).
Hence, published another PR [1] removes the implementation from WA.

OTOH, this patch uses ``ruamel`` instead of ``yaml`` because of the
latter's design issues.

And also this patch fixes pylint issues in ``load_struct_from_yaml()``.

[1] https://github.com/ARM-software/workload-automation/pull/1248

Signed-off-by: Metin Kaya <metin.kaya@arm.com>

setup.py

@@ -105,6 +105,7 @@ params = dict(
         'lxml', # More robust xml parsing
         'nest_asyncio', # Allows running nested asyncio loops
         'future', # for the "past" Python package
+        'ruamel.yaml >= 0.15.72', # YAML formatted config parsing
     ],
     extras_require={
         'daq': ['daqpower>=2'],