WL#6977: Remove all anonymous accounts from all default deployments

Affects: Server-5.7   —   Status: In-Documentation

We require that all anonymous accounts are removed from a default installation-
and deployment process. This worklog outlines how this can be accomplished for
all existing deployment scenarios.
Functional Requirement:

F1: Anonymous user accounts must be removed by default whenever mysql_install_db
is executed.

F2: Provide an option to generate anonymous users.

F3: Scope : RPMs
According to http://dev.mysql.com/doc/refman/5.6/en/linux-installation-rpm.html 

As of MySQL 5.6.8, new RPM install operations (not upgrades) invoke
mysql_install_db with the --random-passwords option that provides for more
secure MySQL installation. Invoking mysql_install_db with --random-passwords
causes it to assign a random password to the MySQL root accounts, set the
“password expired” flag for those accounts, and remove the anonymous-user MySQL
accounts. It will be necessary after installation to start the server, connect
as root using the password written to the $HOME/.mysql_secret file, and assign a
new root password. Until this is done, root cannot do anything else. This must
be done for each root account you intend to use.
See HLS for WL#6962
See LLDS for WL#6962