Remove +dfsg* from docker version

[ReneNyffenegger]

On some Debian installations, the following command docker version --format '{{.Server.Version}}' returns a version number with +dfsg... added, for example: 20.10.5+dfsg1

After removing the dots, the comparison of DOCKER_VERSION with MIN_DOCKER_VERSION throws ./buildContainerImage.sh: line 97: [: 20105+dfsg1: integer expression expected

This pull request also adds the substring +dfsg* from the version number in order for the comparison to have numerical values on both sides.

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