maint: Fix tests that don't run on their own

From the spec directory I found all the specs that fail when run on their own.

for TEST in find . -name "*.rb" -type f; do

spec $TEST > /dev/null 2>&1
if [[ $? != 0 ]]; then
  echo $TEST
fi

done

All of them were cases of missing requires.

Paired-with: Nick Lewis <nick@puppetlabs.com>