The default is not very useful to sort between different
keys and user. Adding the hostname in the comment permit to later
sort them if you start to reuse the key and set them in different
servers. See https://github.com/ansible/ansible/pull/7420
for the rational.
the AIX class uses a unsafe shell for setting the user password (containing a pipe in the command). This patch adopts to the new behavior of module_utils/basic.py (since somewhere around 1.7).
besides it changes the qoutes for the echo command from double to single, because password-hashes contain $-signs and one would not have this variables expanded.
