Fix docker version check to remove the OS identifier from the version

[nasmart]

When running OracleDatabase/SingleInstance/dockerfiles/buildContainerImage.sh I noted the following error:

Checking Docker version.
./buildContainerImage.sh: line 97: [: 190311-ol: integer expression expected
Dockerfile

On investigation I discovered that docker version --format '{{.Server.Version }}' now includes an operating system identifier, e.g. -ol, which makes the current -lt test fail as it expects to compare integers.

This pull request includes a commit to remove the operating system identifier from the docker version, if present.

I've also taken the opportunity the clean up trailing and inconsistent whitespace in the file.

For references my environment is:

• Oracle Linux Server release 7.9
• Docker 19.03.11-ol

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