test: Run autotest.sh with sudo -E

Preserve environment when running autotest.sh, so things like
$HOME work.

Change-Id: Id7f55fda1ad08904b3420263183c84bb19eec87a
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/459265
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: Maciej Szwed <maciej.szwed@intel.com>

autorun.sh

@@ -17,5 +17,5 @@ cat "$conf"
 
 # Runs agent scripts
 $rootdir/autobuild.sh "$conf"
-sudo WITH_DPDK_DIR="$WITH_DPDK_DIR" $rootdir/autotest.sh "$conf"
+sudo -E WITH_DPDK_DIR="$WITH_DPDK_DIR" $rootdir/autotest.sh "$conf"
 $rootdir/autopackage.sh "$conf"