* cpufreq.chart.py PEP 8 code cleanups
Fixes formatting of nested container literals and two cases of using
len() to determine if a container is empty or not.
* python.d/apache.chart.py PEP 8 cleanup.
Makes quotes consistent for string literals and enforces preferred
formatting for container literals.
* python.d/beanstalk.chart.py PEP 8 cleanup
Fixes formatting of container literals.
* python.d/bind_rndc.chart.py PEP 8 cleanup
Fixed container literal formatting.
* python.d/ceph.chart.py PEP 8 cleanup
Fixed container literal formatting and line-continuation indentation.
* python.d/chrony.chart.py PEP 8 cleanups
Fixed container literal formatting and made string literals use
consistent quotes.
* python.d/cpuidle.chart.py PEP 8 cleanup
Fixed container literal formatting and made string literals use
consistent quotes.
