unittests: change self.assertEquals to self.assertEqual

The unittest module has deprecated the former name.

BUG=chromium:980619
TEST=`cros lint` is unchanged

Change-Id: I2b93cc6079d1bf49950ec0cdef7a4edcdf5535ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1810597
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/api/controller/dependency_unittest.py b/api/controller/dependency_unittest.py
index 89c32fd..18b2f10 100644
--- a/api/controller/dependency_unittest.py
+++ b/api/controller/dependency_unittest.py
@@ -65,9 +65,9 @@
       if package_dep_info.package_info.package_name == 'darthvader':
         darthvader_dep = package_dep_info
     self.assertTrue(darthvader_dep)
-    self.assertEquals(darthvader_dep.dependency_packages[0].category,
-                      'troop')
-    self.assertEquals(darthvader_dep.dependency_packages[0].package_name,
-                      'clone')
-    self.assertEquals(darthvader_dep.dependency_source_paths[0].path,
-                      '/control/room')
+    self.assertEqual(darthvader_dep.dependency_packages[0].category,
+                     'troop')
+    self.assertEqual(darthvader_dep.dependency_packages[0].package_name,
+                     'clone')
+    self.assertEqual(darthvader_dep.dependency_source_paths[0].path,
+                     '/control/room')