Re-enable requirement-email tests

Re-enable the requirement-email layout tests that ensure a specific user
within a user with a specific email approved a change.

Change-Id: Ic94ff3570fd88fa7293b399b2d686941fe85d687
diff --git a/tests/fixtures/config/requirements/email/main.yaml b/tests/fixtures/config/requirements/email/main.yaml
new file mode 100644
index 0000000..a22ed5c
--- /dev/null
+++ b/tests/fixtures/config/requirements/email/main.yaml
@@ -0,0 +1,6 @@
+- tenant:
+    name: tenant-one
+    source:
+      gerrit:
+        config-repos:
+          - common-config