tests: use copy as cache type for HDFS

tests/func/test_repro.py

@@ -808,6 +808,10 @@ class TestReproExternalBase(TestDvc):
     def cache_scheme(self):
         return self.scheme
 
+    @property
+    def cache_type(self):
+        return "hardlink"
+
     @property
     def scheme(self):
         return None
@@ -873,7 +877,7 @@ class TestReproExternalBase(TestDvc):
 
         ret = main(["remote", "add", remote_name, remote])
         self.assertEqual(ret, 0)
-        ret = main(["remote", "modify", remote_name, "type", "hardlink"])
+        ret = main(["remote", "modify", remote_name, "type", self.cache_type])
         self.assertEqual(ret, 0)
 
         self.dvc = DvcRepo(".")
@@ -993,6 +997,10 @@ class TestReproExternalHDFS(TestReproExternalBase):
     def scheme(self):
         return "hdfs"
 
+    @property
+    def cache_type(self):
+        return "copy"
+
     @property
     def bucket(self):
         return "{}@127.0.0.1".format(getpass.getuser())