Bug/sc 133701/tachyon setup is rehashing an already hashed

[hugomontero]

Description

• Fix the way setup handle passwords that comes from a config file.
• Fix wifi password setting given that currently is returning undefined instead the actual data.

How to Test

1. Pull down the branch: git pull && git checkout bug/sc-133701/tachyon-setup-is-rehashing-an-already-hashed
2. Attempt to setup a tachyon and save the config: npm start -- tachyon setup --save_config my_config.cfg
3. Attempt to setup again the tachyon but using the previously saved config (save it again): npm start -- tachyon setup --load_config my_config.cfg --save_config my_new_config.cfg

outcome

• wifi password should be stored in the config
• on the second attempt the system password should be match with the first file.

Related Issues / Discussions

Story details: https://app.shortcut.com/particle/story/133701

Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA
• Problem and solution clearly stated
• Tests have been provided
• Docs have been updated
• CI is passing

[azenk]

LGTM 🎉