Return md5sum and filesize in the list of images

Ref https://github.com/GNS3/gns3-gui/issues/1590

tests/handlers/api/compute/test_dynamips.py

@@ -156,7 +156,11 @@ def test_images(http_compute, tmpdir, fake_dynamips, fake_file):
     with patch("gns3server.compute.Dynamips.get_images_directory", return_value=str(tmpdir), example=True):
         response = http_compute.get("/dynamips/images")
     assert response.status == 200
-    assert response.json == [{"filename": "7200.bin", "path": "7200.bin"}]
+    assert response.json == [{"filename": "7200.bin",
+                              "path": "7200.bin",
+                              "filesize": 7,
+                              "md5sum": "b0d5aa897d937aced5a6b1046e8f7e2e"
+                              }]
 
 
 def test_upload_image(http_compute, tmpdir):

tests/handlers/api/compute/test_iou.py

@@ -307,7 +307,7 @@ def test_images(http_compute, fake_iou_bin):
 
     response = http_compute.get("/iou/images", example=True)
     assert response.status == 200
-    assert response.json == [{"filename": "iou.bin", "path": "iou.bin"}]
+    assert response.json == [{"filename": "iou.bin", "path": "iou.bin", "filesize": 7, "md5sum": "e573e8f5c93c6c00783f20c7a170aa6c"}]
 
 
 def test_image_vm(http_compute, tmpdir):

tests/handlers/api/compute/test_qemu.py

@@ -226,7 +226,7 @@ def test_images(http_compute, tmpdir, fake_qemu_vm):
 
     response = http_compute.get("/qemu/images")
     assert response.status == 200
-    assert response.json == [{"filename": "linux载.img", "path": "linux载.img"}]
+    assert response.json == [{"filename": "linux载.img", "path": "linux载.img", "md5sum": "c4ca4238a0b923820dcc509a6f75849b", "filesize": 1}]
 
 
 def test_upload_image(http_compute, tmpdir):