test: allow versitygw command customization, website testing, s3 config fix

tests/util/util_multipart_abort.sh

@@ -14,6 +14,7 @@
 # specific language governing permissions and limitations
 # under the License.
 
+source ./tests/commands/list_multipart_uploads.sh
 source ./tests/util/util_multipart_before_completion.sh
 
 check_abort_access_denied() {

tests/util/util_policy.sh

@@ -14,6 +14,8 @@
 # specific language governing permissions and limitations
 # under the License.
 
+source ./tests/commands/get_bucket_policy.sh
+
 check_for_empty_policy() {
   if ! check_param_count "check_for_empty_policy" "command type, bucket name" 2 $#; then
     return 1

tests/util/util_retention.sh

@@ -14,6 +14,7 @@
 # specific language governing permissions and limitations
 # under the License.
 
+source ./tests/commands/put_bucket_policy.sh
 source ./tests/drivers/params.sh
 
 # params:  bucket name