Proposed changes

Refactoring the system tests to improve the setting

• Use the Cumulocity CA by default
• Move the tedge configuration and connection logic from the the bootstrap.sh script to the ThinEdgeIO RobotFramework library
• Setup keyword improvements
  • Add more setup options, register, register_using and connect
  • Support passing additional bootstrap arguments via bootstrap_args=
• Add additional keywords so that users can also run the same device registration steps manually without using Setup (if users need to customize everything)

Example usage of Setup

Below shows some common usages

# don't run the bootstrap.sh script, register or connect the device
Setup    skip_bootstrap=${True}

# setup the device, but don't register or set the c8y.url
Setup    register=${False}

# setup the device, register it and set the c8y.url, but don't connect it to Cumulocity (e.g. don't run `tedge connect c8y`)
Setup    connect=${False}

# setup the device and pass some additional arguments to the script
Setup    bootstrap_args=--no-secure

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

#3708

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s. You can activate automatic signing by running just prepare-dev once)
• I ran just format as mentioned in CODING_GUIDELINES
• I used just check as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments