- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC Revisions:
256549: man-page updates
256551: .Dd bump in manpage
256553: bootenv -> ROOT fix
257842: monster list of fixes
257843: minor touchup
257844: copy install log
257845: fixup to last
257872: mdoc fixup
257939: debug check
258021: MBR bootcode fixup

Reviewed by: many
Discussed on: -current
Approved by: re (hrs)

MFH (r256338): store some entropy after installation

Approved by: re (gjb)

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

If no resolv.conf has been made for the new system already and the install
media has one already, copy it in lieu of leaving things blank. This
reduces the foot-shooting potential for PXE installs that immediately
add packages.

Remove some debugging code that snuck in.

Add a scripting frontend. Documentation and release(7) support coming later.

Scripts take the form:

------------------------------------
PARTITIONS=ada0
DISTRIBUTIONS="kernel.txz base.txz ports.txz"

#!/bin/sh
echo "sshd_enable=YES" >> /etc/rc.conf
pkg add puppet
echo "System setup complete"
------------------------------------

The second part of the script (beginning with #!) is run in the newly
installed system after the installation onto ada0 (with default partitioning,
see scriptedpart for more complicated scenarios) is complete.