New password_file.yml format needed with unattended installer

[alberpilot]

The password_file.yml new format must be:

# Wazuh indexer admin user
  username: admin
  password: S9YKUya2s4N4WPiTB1kN6ynOcq7CB2QR

# Wazuh dashboard user for establishing the connection with Wazuh indexer
  username: kibanaserver
  password: NiwXQw82pIf0dToiwczduLBnUPEvg7T0

This format includes an empty line to separate sections. It removes the word User (uses username instead of name). It adds a space after the #. It has also rephrased the explanation of the user (please rephrase other users when needed to make it easier to understand).

[rauldpm]

Update report

• Localized and modified files
• Testing regex to check file
• Modified extension file (yml to wazuh)
• Investigating if it is worth parsing the grep to report where the error is

[rauldpm]

Update report

• Finished local testing. Opened PR with testing
• Testing install and unit tests
• Adapted install test, working locally
• Adapting unit tests, multiples test fails

[rauldpm]

Update report

• Unit test are on hold due to new requirements
• Tested change with jenkins pipelines
• Created PR
• Fixed conflicts with latest unify-unattended changes (merge)
• Fixed commit unsigned