add checking for all buildbot builds using lsbcc

[Jeff Johnson]

we've had some "escapes" where packages are picking up non-LSB elements,
usually too-new symbol versions from a native glibc, but also other bits. This
can now happen more easily since some of the buildbot clients may run a newer
distro, we were basically "safe" in the old days when all formal and snapshot
builds were done on SLES10, which was "old enough". Since lsbpkgchk can perform
a full check of a completed package, such a step should be added to buildbot
builds - initially it could be informational rather than fatal if we want, just
as long as we have a way of finding out quickly.