The integration tests have been mostly running on the flex driver
with only a newer test on the csi driver. With the CSI driver being
the preferred driver going forward, now the integration tests will
all be running with the CSI driver with the exception of a test
suite that is only dedicated to the flex driver.

A number of other test improvements are also made for code
readability, test stability, and removing unused options.
Signed-off-by: Travis Nielsen <tnielsen@redhat.com>