This patch adds a simple check to see if the kernel
even supports Fibre Channel before calling systool -c fc_host -v
to find the active HBA's on the system.
The problem is that privsep can't quietly run systool without puking out
a bunch of errors to stderr. We know that most systems don't have FC and
that's why we always wrapped out call to putils executing systool
with a try block. putils allows callers to expect exceptions and then
handle the exception logging or not themselves. privsep doesn't allow that.
Change-Id: Idd254303c9cca2b57d358de2fdbaf8abdd76b553
4cc4f0dda2