fix decoding of utf-8 chars in yaml test
Python 3 would fail to load yaml from doc/examples/cloud-config-apt.txt when the LANG (specifically LC_CTYPE) was 'C'. The changes here do 2 things: a.) remove the non-ascii characters from the yaml file. b.) fix the validate-yaml.py program to decode using utf-8 specifically rather than using the inherited settings. This fixes it now for ascii and in the future also should non-ascii slip in.
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