rpms: Fix handling of x86 architectures

rpms: Fix handling of x86 architectures

Once upon a time, our specfile would assume that if you were
building for i386 you were building userspace, and that i586 or i686
implied doing a kernel only build. This is no longer the case, and
now everything on modern Fedora is built for i686, so we should adapt
the spec file for this.

Reviewed-on: http://gerrit.openafs.org/4970
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 84a3c4714fce3c1722802963e1fcc4d7dad8cc55)

Change-Id: I16c2a4a6586e63be967b5fb019ede10a24c6cde4
Reviewed-on: http://gerrit.openafs.org/5202
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>