Revert "'slapos proxy start' must be run as root"

This reverts commit 280232a7c541695499d957831da2474eaea48587.
cli: no need to be root to launch supervisor
Release slapos.core 1.0.5
removed broken test (was going through mocks), removed old slow chown code
added computer_guid example in --help
CLI: --log-color option, disabled by default. Safe for log redirection.