VAX bootxx has had ffsv2 support since May 2018, allow its use as boot
filesystem in sysinst.

Sucessfully tested in simh-microvax3900 booting from FFSv2ea.

Define DEFSWAPSIZE properly. DEFSWAPRAM seems obsolete.

Sync install size estimates with current reality

Unify handling of CDROM device names.
Skip CDs when looking for install targets (we do not support installing
onto a blueray with UDF).

Fix search for the default CDROM device and the CD we booted f

Unify handling of CDROM device names.
Skip CDs when looking for install targets (we do not support installing
onto a blueray with UDF).

Fix search for the default CDROM device and the CD we booted from
for ports with nonstandard CDROM device names.

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Get rid of hard coded disk names and use sysctl hw.disknames
instead.

Move sysinst sources to usr.sbin.

This commit only physically moves the sources - there are no other
changes, to maximize the probability that this will be treated as a
rename if we ever do manage t

Move sysinst sources to usr.sbin.

This commit only physically moves the sources - there are no other
changes, to maximize the probability that this will be treated as a
rename if we ever do manage to migrate away from CVS.

Moving sysinst has been discussed on and off for years and has two
goals: making it easier to work on sysinst, and also making sysinst
available on running systems for use installing chroots and VM images
and other such things. None of the latter is possible yet, but as they
say, one thing at a time.

Doing this now was approved in an impromptu fashion by mrg, riz,
riastradh, me, and groo.

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