Allow empty ansible_user

[pallxk]

Changes

Allow ansible_user to be specified as an empty string.

ansible_user specifies the username to use when connecting to hosts, but it should not be required to have a value in my opinion as the same info may also

• be provided in ~/.ssh/config;
• be omitted if it happens to be the same username on both local and remote;
• be unnecessary if using local connection.

Linked Issues

None.

[dereknola]

This seems like an unnecessary complication. To support a local configuration, you would already need to modify the playbook/site.yml to have connection: local to support a localhost host value. At that point, why not just modify your inventory to also include the ansible_user: MY_LOCAL_USER. This change doesn't really help with a better "default case" as further modification to code is still required.