nrelease: Simplify the adjustments to loader.conf for IMG boot

Use 'sed' similar to fstab adjustments instead of grep+echo to adjust
'boot/loader.conf' to the IMG boot.

nrelease: Adjust fstab to remove '-C' option for /tmp tmpfs mount

For the /tmp mount, no need to copy the origin contents; also, there
shouldn't be any contents at this early boot stage.

nrelease: Adjust fstab and reuse it for IMG boot

The root '/' filesystem is mounted by the kernel, so it can be omitted
from 'etc/fstab'. This also makes the 'fstab' file be used by the IMG
boot, s

nrelease: Adjust fstab and reuse it for IMG boot

The root '/' filesystem is mounted by the kernel, so it can be omitted
from 'etc/fstab'. This also makes the 'fstab' file be used by the IMG
boot, so just reuse it.

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nrelease: Fix up rc.conf to mount root readwrite for IMG boot

While there, remove the obsolete comments in 'etc/rc.conf'.

nrelease: Add root_rw_mount="NO" to rc.conf to fix ISO boot

The ISO root filesystem is obviously readonly and cannot be remounted to
'rw'. Without setting 'root_rw_mount=NO', the ISO boot would abo

nrelease: Add root_rw_mount="NO" to rc.conf to fix ISO boot

The ISO root filesystem is obviously readonly and cannot be remounted to
'rw'. Without setting 'root_rw_mount=NO', the ISO boot would abort
after failing to remount the root filesystem.

This is a follow-up fix to my previous commit
31b00396377857ebb62259aa944f9351fa62ea44.

Reported-by: Sergey Zigachev (servik)

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ttys: Enable video ttys only if the device exists

Credit: https://reviews.freebsd.org/D15169