Bunch of fixes & improvements

[metin-arm]

Dropped the changes in tests/test_target.py for now. Should be OK to merge.

• ec006a0 - test_target: Add copyright statement
• be6dc8c - ChromeOsTarget: Fix building SSH connection parameter list
• f54bef0 - utils/ssh: Load host keys only if strict_host_check is true
• 34da9f9 - target: Customize as_root parameter of *write_value()
• 95f4a28 - devlib: Remove unused imports
• 121921f - devlib/init: Resolve pylint issues
• 586e340 - doc/connection: Fix typo Telenet

[metin-arm]

Hey @marcbonnici, can you please review this merge request? Thanks in advance.

[metin-arm]

The current state LGTM, perhaps some of your initial test changes could be a separate PR?

I only have a copyright change in tests as of now. That said, will file another PR for further changes in tests. Thanks.

[douglas-raillard-arm]

@marcbonnici LGTM