Add API's for managing bucket quota (#9379)

This PR allows setting a "hard" or "fifo" quota
restriction at the bucket level. Buckets that
have reached the FIFO quota configured, will
automatically be cleaned up in FIFO manner until
bucket usage drops to configured quota.
If a bucket is configured with a "hard" quota
ceiling, all further writes are disallowed.

cmd/test-utils_test.go

@@ -322,7 +322,7 @@ func UnstartedTestServer(t TestErrHandler, instanceType string) TestServer {
 	testServer.AccessKey = credentials.AccessKey
 	testServer.SecretKey = credentials.SecretKey
 
-	httpHandler, err := configureServerHandler(testServer.Disks)
+	httpHandler, err := configureServerHandler(testServer.Disks, false)
 	if err != nil {
 		t.Fatalf("Failed to configure one of the RPC services <ERROR> %s", err)
 	}