updated sar options to collect more data

in order to have better data on the load state of the test nodes
we should track things beyond just cpu time. Add in load time,
process creation rates, and io rates during the tests.

also add a sar filter that makes it report on one line

reading sar input with multiple flags is somewhat problematic,
because it's tons of interspersed headers. So build something with
does a pivot filter to make it possible to get this all on one
line.

Change-Id: I8f085cedda65dfc37ad530eb97ba1fc5577314c3
Merge "updated sar options to collect more data"
Merge branch 'master' of github.com:openstack-dev/devstack