Draft: added support for influxdb tags in DCS uploads

Overview:

• Added fields in influxdb_connectivity.json
  • use_ssl (boolean): support for SSL in influxdb data retrieval (influxdbtool-retrieve script)
  • influx_path: support for different influxdb paths (servername.edu/)
  • tags: optional tags to filter output of influxdb query
• Changed some logger.warn()’s (deprecated) to logger.warning()
• Support for SSL (some changes to modules/localdb.py) See slides about changes here: https://docs.google.com/presentation/d/10r2KbZK0p12RWubCQwTTFrkEtH03LAgXYhbHIdmsdmI/edit?usp=sharing