Make default installations a bit more secure:
- push a bit harder for setup of a root password
- simplify/clarify manual entropy setup
- visit the entropy setup (on machines where it is needed) on the
default path through sysinst

Fix accidental word duplication

Re-enable the entropy handling code in sysinst (only visible on machines
that do not have full entropy), but move it to the config menu
instead of enforcing it as mandatory step.

This menu is shown at the end of the setup, or if explicitly invoked
from the main menu.

Some of the input options are complex but useful in some situations
and code to support them is tiny. Most users will use the manual input
(first + default option) but some might prefer to connect a USB TRNG
or have easy setups to transfer entropy from another machine (while
copy & paste on a serial console sometimes is tricky).

Fix copy & pasted copyright comments.

Add (experimental) entropy input support:
Early during new installs or after upgrades we check if entropy is
available. If not (no hardware random number generator available)
we inform the user and ask them to fix it.

Fix accidental word duplication

Re-enable the entropy handling code in sysinst (only visible on machines
that do not have full entropy), but move it to the config menu
instead of enforcing it as mandatory step.

This menu is shown at the end of the setup, or if explicitly invoked
from the main menu.

Some of the input options are complex but useful in some situations
and code to support them is tiny. Most users will use the manual input
(first + default option) but some might prefer to connect a USB TRNG
or have easy setups to transfer entropy from another machine (while
copy & paste on a serial console sometimes is tricky).

Fix copy & pasted copyright comments.

Add (experimental) entropy input support:
Early during new installs or after upgrades we check if entropy is
available. If not (no hardware random number generator available)
we inform the user and ask them to fix it.

Fix copy & pasted copyright comments.

Add (experimental) entropy input support:
Early during new installs or after upgrades we check if entropy is
available. If not (no hardware random number generator available)
we inform the user and ask them to fix it.