Merge the bouyer-xenpvh branch, bringing in Xen PV drivers support under HVM
guests in GENERIC.
Xen support can be disabled at runtime with
boot -c
disable hypervisor

unhook umass_isdata.c from here too

Add a COMMENT describing what each component roughly does.

"make describe" prints the comment.

Requested/inspired by Vincent Schwarzer on rumpkernel-users

opt files were nop't

fix snafu to enable umass component also for amd64

rename component.c -> umass_component.c

Split scsipi out of librumpdev_umass into librumpdev_scsipi. umass
still compile time depends on scsipi in the sense of "ifdef
NATAPIBLUES", but I'm not going to fix that now.

Rename IOCONFIG to IOCONF. It matches the config(1) keyword and
aligns better in Makefiles.

Support SCSIVERBOSE.

Globally define -Wno-pointer-sign, as it has become a pointless
exercise of "add it to every Makefile individually".

XXX: should autosynchronize with the rest of the kernel buildflags
in sys/conf/Ma

Globally define -Wno-pointer-sign, as it has become a pointless
exercise of "add it to every Makefile individually".

XXX: should autosynchronize with the rest of the kernel buildflags
in sys/conf/Makefile.kern.inc.

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I forgot I didn't fix kern/40505 yet, and hence using delay()/DELAY()
in rumps is hard due to some archs having a colorful idea of what
they should be like. So temporarily disable build of component

I forgot I didn't fix kern/40505 yet, and hence using delay()/DELAY()
in rumps is hard due to some archs having a colorful idea of what
they should be like. So temporarily disable build of components
using those for non-i386 (use the no-need-to-mess-with-setlists
approach).

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Move a bunch of rump components from dev/wip to dev/lib now that
they've reached a certain maturity.