tests: Skip docker cp integration test for devicemapper storage

docker cp is not expected to work while using block device
instead of the overlay file system.
Skip docker cp test in case of devicemapper storage driver.

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

Author: amshinde

tests/integration/docker/cp.bats

@@ -34,6 +34,11 @@ setup() {
 	content="test"
 	testfile=$(mktemp --tmpdir="$BATS_TMPDIR" --suffix=-cor-test)
 	$DOCKER_EXE run --name $container -tid ubuntu bash
+	driver=$($DOCKER_EXE inspect --format '{{ .GraphDriver.Name }}' $container)
+	if [ "$driver" == "devicemapper" ] ; then
+		$DOCKER_EXE rm -f $container
+		skip
+	fi
 	echo $content > $testfile
 	$DOCKER_EXE cp $testfile $container:/root/
 	$DOCKER_EXE exec -i $container bash -c "ls /root/$(basename $testfile)"