Fixed a typo.
Corrected the name of the operating system.

Automatic whitespace cleanup too. No functional changes.
Launch ReadOnlyBootPrompt if $freshInstallIndicator exists.

That file will exist on every read-only media, first boot of writable images
(usb,vmdk), and (if installing directly to partition via the build system or a
mounted image file) hard disk.

The last scenario (of installing directly to hard disk through the build system
or mounted image file) may not be ideal, but it generally tends to be an
advanced installation method. Additionally, it will occur only on first boot.

Fixes #8945.
networksetup+: Adjust add-on path to match preflet name
networksetup+: Simplify media check

* Lets just rely on IsWireless and friends
  in BNetworkInterface as we are checking
  the same thing twice.