Remove poorly made color output

The colors cannot be used easily anyway (due to file output of
both stdout and stderr).
Remove unused imports
Remove unused class

This class will be rewritten separately.
Suppress or avoid PyDev warnings
Remove `set_sudo_timeout` func

There is a way to provide sudo passwords non-interactively and it
should be implemented instead of avoiding typing.
Remove code matching checksum

This procedure is a half-measure. And the future idea is to
replicate Master code on Slaves anyway.
Minor fixes
Merge branch 'cleanup'