Reformat imports to a consistent style for imports

rustfmt.toml configuration:
  imports_granularity = "One"
  group_imports = "One"

runtime/src/snapshot_config.rs

@@ -1,6 +1,8 @@
-use crate::snapshot_utils::{self, ArchiveFormat, SnapshotVersion};
-use solana_sdk::clock::Slot;
-use std::path::PathBuf;
+use {
+    crate::snapshot_utils::{self, ArchiveFormat, SnapshotVersion},
+    solana_sdk::clock::Slot,
+    std::path::PathBuf,
+};
 
 /// Snapshot configuration and runtime information
 #[derive(Clone, Debug)]