grafana: Sync status

[SurfingNerd]

make panel for sync_status.

syncing nodes are contributing to current epoch.
is the tracked syncstatus wrong sometimes ?

DMDcoin/diamond-node#27

        r.register_gauge(
			"sync_status",
			"WaitingPeers(0), SnapshotManifest(1), SnapshotData(2), SnapshotWaiting(3), Blocks(4), Idle(5), Waiting(6), NewBlocks(7)", 
			match self.eth_handler.sync.status().state {
			SyncState::WaitingPeers => 0,
			SyncState::SnapshotManifest => 1,
			SyncState::SnapshotData => 2,
			SyncState::SnapshotWaiting => 3,
			SyncState::Blocks => 4,
			SyncState::Idle => 5,
			SyncState::Waiting => 6,
			SyncState::NewBlocks => 7,
        });