The luseradd / lusermod commands do not support the -e option. Set
the expiry time in this case via lchage after the user was
created / modified.
Fixes: #71942
In Python3 math.floor returns an integer whereas Python2 returns a float.
Hence always convert the result of math.floor to an int to ensure that
lexpires is an integer.
Move local expires tests in a separate file and import the tasks to the
main.yml to keep main.yml smaller.
