The RequestQueue for chunk servers should be initialized when the
connection is actually established in get_chunk_server_connection(),
not ahead of time during tinydfs_init().
The metadata server RequestQueue initialization remains in tinydfs_init()
since the metadata server connection is established during initialization.
Changes:
- Removed premature RequestQueue initialization for chunk servers
- Added clarifying comments about initialization timing
- RequestQueue is initialized in get_chunk_server_connection() (line 227)