[docker]:[feature] - Validate Docker version from the Docker API

[luiguip]

Signed-off-by: Luis Guilherme de A luisguilhermepdea@gmail.com

- What I did

I changed the way the version of docker is retrieved, from a shell command execution to Docker API.
This pull-request solves the issue #757

- How to verify it

With the docker running, run the horusec and it will validate the Docker version, from the Docker API.

- Description for the changelog
The log error message of an error with the docker validation had changed. Now few steps of preprocessing are necessary to retrieve the version.

[matheusalcantarazup]

The Validate function could be simplified to this:

	version, err := validateIfDockerIsInstalled()
	if err != nil {
		return err
	}
	return validateIfDockerIsRunningInMinVersion(version)
}

And validateIfDockerIsSupported could be removed.

[luiguip]

Requested changes done.

[matheusalcantarazup]

LGTM

Thanks very much for your contribution @luiguip

[iancardosozup]

closes #963