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* refactor
* better output (number of resolved IPs, error after test status)
* new mandatory level : `nocrash`

See merge request bortzmeyer/homer!27

This is to use with tests that are not documented in the RFC and where
the response of the server is unknown. We think it is good that the server
do not crash when facing those tests.

and output IP on error

Use level of 30 (legal) for the truncated check in order to avoid
regression with the tests.

Do not return any state from the print_result method. The success's
state should already be known when calling this method.

Move monitoring code into new module

See merge request bortzmeyer/homer!26

Exceptions

* fix regression inserted with 8cba1a31
* [DoT] raise exceptions instead of printing errors
* improve test coverage

See merge request bortzmeyer/homer!25

Do not print error, instead raise an exception that need to be caught.
The calling method will then decide if the error should be displayed or
not.

Fix regression inserted with 8cba1a31

Readme, explain the goal of the tool.

See merge request bortzmeyer/homer!24

Partition code into modules
Remove --sync option

See merge request bortzmeyer/homer!23