MFC: sbin/geom/class/eli/geli.8 1.18-1.20
sbin/geom/class/eli/geom_eli.c 1.15,1.16
sys/geom/eli/g_eli.h 1.12
sys/geom/eli/g_eli_ctl.c 1.9,1.10
tools/regression/geom_eli/configure-b-B.t 1.1
tools/regression/geom_eli/readonly.t 1.1

sys/geom/eli/g_eli_ctl.c:1.9

• Remove extra arguments.

sbin/geom/class/eli/geom_eli.c:1.15
First kill detached providers, because of two reasons:

• after killing all attached providers, all providers are then detached and operation is repeated for those who were attached,
• we don't want to remove keys for read-only attached providers, we only want to detach them.

sbin/geom/class/eli/geli.8:1.18
Note that we don't destroy keys on read-only attached providers.

tools/regression/geom_eli/readonly.t:1.1
Regression tests for read-only option (attach -r).

src/sbin/geom/class/eli/geli.8:1.19
src/sbin/geom/class/eli/geom_eli.c:1.16
src/sys/geom/eli/g_eli.h:1.12
src/sys/geom/eli/g_eli_ctl.c:1.10
Add 'configure' subcommand which for now only allows setting and removing
of the BOOT flag. It can be performed on both attached and detached
providers.
Requested by: Matthias Lederhofer <matled@gmx.net>

tools/regression/geom_eli/configure-b-B.t:1.1
Add regression tests for 'geli configure' subcommand.

sbin/geom/class/eli/geom_eli.c:1.17
Fix copy&paste mistake.
Submitted by: Matthias Lederhofer <matled@gmx.net>

sbin/geom/class/eli/geli.8:1.18
Remove a contraction and add a missing article.
Commit to HEAD by: brueffer

Approved by: re (mux)