fix: use 1.8-alpine

fix: switch to python3 (#11)

closes #7 
fix: skip idempodence test on compact

minor integration improvements (#6)

* add 'inputs.ping' defaults
* fix lint warnings (ansible-galaxy)
* try test query 3 times
* add debug to tests
* increase cq interval

fix ansible include_tasks and fix tests (#5)

* fix deprecated variable passing: ansible/ansible#32812

* wait longer for CQ to run

* add show continuous queries

* increase wait for CQ again (to be sure)

* speed up test (reduce CQ interval and test wait)

* increase wait time again

* debug telegraf input

* add more debug

* run telegraf priviledged

* logs influxdb

+ Verify configuration before execution (assertions)

+ "compact" feature, to downsize RAW data after aggregation
+ "seamless" switch from old to new RAW RP during operation (gap backfill 2x)
+ support empty (default) retention policy in source
+ some variables refactoring/structuring + general cleanup
+ full example and documentation, incl. demo
+ Travis-ci: 4 parallel tests and global env for tests

Release/0.2

Release of first version