Also refactor setting flags for running kpod

* Remove duplicate definitions of storage-related flags for kpod, since
  we set them in helpers.bash now, and the other locations that were
  also setting it were doing so after loading the definitions in
  helpers.
* Set kpod storage flags after checking if we need to force use of the
  "vfs" storage driver for cri-o, to make sure kpod also ends up with
  the same override if we're using one.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

test/kpod_export.bats

@@ -3,10 +3,6 @@
 load helpers
 
 IMAGE="redis:alpine"
-ROOT="${TESTDIR}/crio"
-RUNROOT="${TESTDIR}/crio-run"
-# Do not add --storage-driver vfs
-KPOD_OPTIONS="--root ${ROOT} --runroot ${RUNROOT} --runtime ${RUNTIME_BINARY}"
 
 function teardown() {
     cleanup_test