This change fixes the case where the compressed file (e.g. tools.tgz) only
contains a folder with the same name (e.g. tools) in its root folder.

tools.tgz:
|- tools
   |- fileA.txt
   |- fileB.txt
   \- fileC.txt

In that case, the "smart" folder creation mechanism will extract the files in
a folder "tools", and this extraction folder will contain a single folder with
the same name.

Before this fix, the tool would try to move out the inside folder to the parent
one, but there would already be a folder named "tools", so it would generate a
conflict.

This change first renames the inside folder to a random string, and only then
it is moved outside and the old extraction folder is deleted.