Exit on sigar errors that can't be ignored.
Exit on sigar errors that can't be ignored.

Change-Id: Icf5b9d111facf86e0b4abd689dce2ed82d8d46ca
Reviewed-on: http://review.couchbase.org/46909
Tested-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

couchbase/sigar,couchbase/sigar