replicaset: use vshard bootstrap timeout as bootstrap timeout

The `--timeout` flag for `tt vshard bootstrap` is now passed as
`vshard.router.bootstrap({timeout=...})`. It allows to increase
the real bootstrap process timeout.

Part of tarantool/tt-ee#232

CHANGELOG.md

@@ -28,6 +28,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - `tt log -f` crash on removing log directory.
 - `tt connect` crash due to an empty response.
 - `tt start` error on start Tarantool 3 with encrypted etcd.
+- `tt replicaset vshard bootstrap` unable to bootstrap large clusters due to
+  a timeout.
 
 ### Changed
 

cli/replicaset/lua/cconfig/bootstrap_vshard_body.lua

@@ -24,7 +24,7 @@ local deadline = fiber.time() + timeout
 local ok, err
 
 while fiber.time() < deadline do
-    ok, err = vshard.router.bootstrap()
+    ok, err = vshard.router.bootstrap({timeout = timeout})
     if ok then
         break
     end