Fixed #21674 -- Deprecated the import_by_path() function in favor of import_string().

Thanks Aymeric Augustin for the suggestion and review.

django/template/context.py

@@ -1,5 +1,5 @@
 from copy import copy
-from django.utils.module_loading import import_by_path
+from django.utils.module_loading import import_string
 
 # Cache of actual callables.
 _standard_context_processors = None
@@ -162,7 +162,7 @@ def get_standard_processors():
         collect.extend(_builtin_context_processors)
         collect.extend(settings.TEMPLATE_CONTEXT_PROCESSORS)
         for path in collect:
-            func = import_by_path(path)
+            func = import_string(path)
             processors.append(func)
         _standard_context_processors = tuple(processors)
     return _standard_context_processors

django/template/loader.py

@@ -28,7 +28,7 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.template.base import Origin, Template, Context, TemplateDoesNotExist
 from django.conf import settings
-from django.utils.module_loading import import_by_path
+from django.utils.module_loading import import_string
 from django.utils import six
 
 template_source_loaders = None
@@ -95,7 +95,7 @@ def find_template_loader(loader):
     else:
         args = []
     if isinstance(loader, six.string_types):
-        TemplateLoader = import_by_path(loader)
+        TemplateLoader = import_string(loader)
 
         if hasattr(TemplateLoader, 'load_template_source'):
             func = TemplateLoader(*args)