fix setup.py and tests so that Python 3.4 and 3.8 work #2152
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Python 3.4 needs to not install the latest version of PyYAML (3.4 has reached end-of-life; we're only keeping it around to support old AMIs)
pyspark
doesn't currently support Python 3.8, so we need to not install it when testing, and we need to properly skip all the tests that depend onpyspark
.