tools/create-openbsd*sh: use cdn.openbsd.org not cloudflare, install vmm-firmware

[blackgnezdo]

No description provided.

[blackgnezdo]

@mptre @dvyukov

I suppose we care about these names S_IFMT, S_IFCHR being compliant since the linter is failing builds now:
https://travis-ci.org/google/syzkaller/jobs/444800787

env CGO_ENABLED=1 gometalinter.v2 ./...
sys/openbsd/init.go:24:2:warning: don't use ALL_CAPS in Go names; use CamelCase (golint)
sys/openbsd/init.go:25:2:warning: don't use ALL_CAPS in Go names; use CamelCase (golint)
make[1]: *** [gometalinter] Error 1
make[1]: Leaving directory `/home/travis/gopath/src/github.com/google/syzkaller'
make: *** [presubmit] Error 2
The command "make presubmit" exited with 2.

Is there any reason why the names shouldn't be fixed? The struct in question seems to be private to the package and I don't see any trace of reflection burrowing in the guts of this struct.

[blackgnezdo]

Nevermind, I found a8292de

[blackgnezdo]

@dmitshur, FYI
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