Imply vshard roles (#165)

Two new cartridge role properties were introduced in
tarantool/cartridge#1217:

```
implies_router = true,
implies_storage = true,
```

They're necessary to preserve Cartridge WebUI operability (bootstrap
vshard button visible) even if vshard roles are hidden explicitly.

This patch adds these properties to the crud roles, as they
already have corresponding dependencies.

Author: rosik

CHANGELOG.md

@@ -26,6 +26,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
     if present in `package.loaded`. It allows to avoid ignoring errors on checking
     modules existing via `pcall(require, '<module_name>')`.
 * Fixed some cases when module ignored schema updates.
+* Preserve "Bootstrap vshard" button in WebUI operable even if vshard
+  roles are hidden explicitly.
 
 ### Added
 

cartridge/roles/crud-router.lua

@@ -13,5 +13,6 @@ return {
     role_name = 'crud-router',
     init = init,
     stop = stop,
-    dependencies = {'cartridge.roles.vshard-router'}
+    implies_router = true,
+    dependencies = {'cartridge.roles.vshard-router'},
 }

cartridge/roles/crud-storage.lua

@@ -12,5 +12,6 @@ return {
     role_name = 'crud-storage',
     init = init,
     stop = stop,
-    dependencies = {'cartridge.roles.vshard-storage'}
+    implies_storage = true,
+    dependencies = {'cartridge.roles.vshard-storage'},
 }