Fixing logging, changing info to debug to avoid clutter (#622)

* Changing FSDP init to by pass pg validation for freshly minted pgs inside of init.

* Addressing Min's review comments.

* Changing logging in init to debug from info

* Changing logging in init to debug from info
Co-authored-by: Giri Anantharaman <giriman@devfair0439.h2.fair>

fairscale/nn/data_parallel/fully_sharded_data_parallel.py

@@ -271,7 +271,7 @@ class FullyShardedDataParallel(nn.Module):
         self._return_full_state_dict = True
         init_end = time.time()
 
-        logging.info(
+        logging.debug(
             f"FSDP.__init__(done): total_init_time: {(init_end - init_start): .4f} num_params: {(sum(p.numel() for p in self.params))}"
         )