allow multiple certbots with different providers

[abom]

Description

Allow using certbot with multiple providers e.g. letsencrypt, zerossl, or custom acme servers.

Changes

• Update nginx sal to allow selecting provider/certbot with custom run command for each implementation.

Related Issues

Blocked on threefoldtech/js-ng#465.

Checklist

• Tests included
• Build pass
• Documentation
• Code format and docstrings

[codecov-io]

Codecov Report

Merging #1362 (1d601da) into development (238b13d) will increase coverage by 0.27%.
The diff coverage is 81.81%.

@@               Coverage Diff               @@
##           development    #1362      +/-   ##
===============================================
+ Coverage        32.13%   32.40%   +0.27%     
===============================================
  Files              134      134              
  Lines            12902    12975      +73     
===============================================
+ Hits              4146     4205      +59     
- Misses            8756     8770      +14     

Impacted Files	Coverage Δ
jumpscale/sals/nginx/nginx.py	85.06% <80.28%> (-2.15%)	⬇️
jumpscale/servers/threebot/threebot.py	70.44% <100.00%> (+0.24%)	⬆️

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