Installation tests

[curusarn]

I broke the installation couple of times already.

The issue is that there are multiple cases:

• Install on a new device
• Update - different states based on the previously installed version

TODO: Add even a simple regression tests for installation and updates

[curusarn]

Check if:

• the daemon starts
• reshctl and other functions are being loaded
• binaries and other files were copied
• config was copied
• dotfiles contain resh source directive