align headers, clean up imports & fix typo

[MatthiasWinzeler]

Hi folks

As discussed with @rainerleber in https://github.com/sap-linuxlab/community.sap_launchpad/pull/16#discussion_r1386496873, the file headers are in need of some alignment ;)

This PR does the following:

• remove any encoding header since they are not needed with python 3 (do we need to support python 2 still?)
• remove any shebangs in the module_utils, add them to modules (only these are invoked directly)

Along the way I fixed a typo and arranged some imports - see inline comments.

[MatthiasWinzeler]

@rainerleber thanks! Can you merge the PR? I'm afraid I don't have the rights:

Only those with write access to this repository can merge pull requests.

[sean-freeman]

PR #16 merged to main instead of dev, second part of the PR (this) has been left behind. Merging to main and then performing merge back.

[MatthiasWinzeler]

@sean-freeman thanks!