[common-utils] Fix group creation if a group with the given id already it exists #1159
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On my computer I have user id 501 and group id 20 which I want to preserve within the container.
However, that group id often already exists in a lot of containers.
Container creation fails when using common-utils and setting the
userGidto the id of an already existing group, because the current implementation just tries to add the group right away.This PR adds functionality to detect whether a group with the given id already exists and handles it accordingly.