This is mostly a confirmation that the subsequent changes
to #1905 were correct; the "name" key set in a partition
configuration is applied to the partition.

FIXES #1904

Extend the test to (try to) restore whatever hostname was set
before the test ran; this avoids mangling systems where tests
are run as root in a host / production environment.

FIXES #1908

Avoid setting rootfs partition name to "root" by default.

Added spaces and line-breaks to fix formatting.

Fixes a formatting issue by adding some spaces and a line-break. Increases readability

Scrolling explicitly to the bottom isn't needed; leaving it
up to appendPlainText() has the following behavior:

- if the text is scrolled all the way down, follows the text
  and scrolls further down (tailing)
- if it is not scrolled all the way down, keeps current position.

FIXES #1894

- makes the displayed flag name consistent between dialog and
  pop-up and debug-messages.

- apply coding style
- reduce shadowed variables
- use Q_EMIT to mark signals

allow viewing live log during execution

Existing code reinitialized the layout, losing whatever
layout was set in the config. Refactor so that you can
access the partition-layout API, and change the default
FS through that -- which is the point of the code block
here in `doAutopartition()`, to look up the currently-
selected default FS.

Inspired by Santosh's work in #1903, #1759.

Fix empty UUID detection in fstab

By default, calamares renames the label of root partition
to "root" overriding the name specified in partiton.conf

Signed-off-by: Santosh Mahto <santosh.mahto@collabora.com>