[TASK] allow self-signed certification in influxdb

[genofire]

Description

see #133

Motivation and Context

Checklist:

• My code follows the code style of this project.
• I have added also tests for my new code.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[codecov-io]

Codecov Report

Merging #135 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
+ Coverage   73.68%   73.76%   +0.08%     
==========================================
  Files          47       47              
  Lines        1573     1578       +5     
==========================================
+ Hits         1159     1164       +5     
  Misses        386      386              
  Partials       28       28

Impacted Files	Coverage Δ
database/influxdb/database.go	74.41% <100%> (+1.57%)	⬆️