Stephen Finucane 2a969467dc Simplify instance name generation
Support for the 'multi_instance_display_name_template' option was
removed in commit 0e43002c9 and booting multiple instances now will
simply result in a simple numerical suffix (-1, -2, -3, ...) being added
to the instance's 'display_name' and 'hostname' attributes.

We're now in a position to greatly simplify how we do this, so do just
that, removing some comments and updating some documentation that
referenced the removed option in the process.

Change-Id: If5369bcf4a6f7fc36190e153776e60446eb14040
2018-06-18 14:46:44 +01:00
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