When --net=none enabled, the test uses local filesystem

Closes #10963
Signed-off-by: Srini Brahmaroutu <srbrahma@us.ibm.com>

integration-cli/docker_cli_build_test.go

@@ -770,16 +770,24 @@ RUN [ $(ls -l /exists/exists_file | awk '{print $3":"$4}') = 'dockerio:dockerio'
 }
 
 func TestBuildCopyAddMultipleFiles(t *testing.T) {
+	server, err := fakeStorage(map[string]string{
+		"robots.txt": "hello",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer server.Close()
+
 	name := "testcopymultiplefilestofile"
 	defer deleteImages(name)
-	ctx, err := fakeContext(`FROM busybox
+	ctx, err := fakeContext(fmt.Sprintf(`FROM busybox
 RUN echo 'dockerio:x:1001:1001::/bin:/bin/false' >> /etc/passwd
 RUN echo 'dockerio:x:1001:' >> /etc/group
 RUN mkdir /exists
 RUN touch /exists/exists_file
 RUN chown -R dockerio.dockerio /exists
 COPY test_file1 test_file2 /exists/
-ADD test_file3 test_file4 https://dockerproject.com/robots.txt /exists/
+ADD test_file3 test_file4 %s/robots.txt /exists/
 RUN [ $(ls -l / | grep exists | awk '{print $3":"$4}') = 'dockerio:dockerio' ]
 RUN [ $(ls -l /exists/test_file1 | awk '{print $3":"$4}') = 'root:root' ]
 RUN [ $(ls -l /exists/test_file2 | awk '{print $3":"$4}') = 'root:root' ]
@@ -789,7 +797,7 @@ RUN [ $(ls -l /exists/test_file4 | awk '{print $3":"$4}') = 'root:root' ]
 RUN [ $(ls -l /exists/robots.txt | awk '{print $3":"$4}') = 'root:root' ]
 
 RUN [ $(ls -l /exists/exists_file | awk '{print $3":"$4}') = 'dockerio:dockerio' ]
-`,
+`, server.URL),
 		map[string]string{
 			"test_file1": "test1",
 			"test_file2": "test2",