configuration: add details about sudoers configuration when adding non-root user
configuration: add details about sudoers configuration when adding non-root user

Signed-off-by: Rohit Yadav <902b9eb5dd62819678163bd5e00fbf0cbc7c264b@shapeblue.com>

apache/cloudstack-docs-install,unodba/cloudstack-docs-install,apache/cloudstack-docs-install,apache/cloudstack-docs-install,unodba/cloudstack-docs-install,pdion891/cloudstack-docs-install,unodba/cloudstack-docs-install,pdion891/cloudstack-docs-install,pdion891/cloudstack-docs-install