avoid spurious timer events at startup

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #931 (9194dc7) into master (22795ed) will increase coverage by 0.03%.
The diff coverage is 0.00%.

❗ Current head 9194dc7 differs from pull request most recent head 509552e. Consider uploading reports for the commit 509552e to get more accurate results

@@            Coverage Diff             @@
##           master     #931      +/-   ##
==========================================
+ Coverage   49.37%   49.40%   +0.03%     
==========================================
  Files         415      415              
  Lines       46572    46576       +4     
==========================================
+ Hits        22995    23013      +18     
+ Misses      21574    21557      -17     
- Partials     2003     2006       +3     

Impacted Files	Coverage Δ
cmd/cortex/main.go	22.54% <ø> (+2.54%)	⬆️
cmd/utils/flags.go	1.93% <0.00%> (-0.05%)	⬇️
ctxc/fetcher/block_fetcher.go	0.00% <0.00%> (ø)
consensus/cuckoo/sealer.go	0.00% <0.00%> (-5.76%)	⬇️
consensus/cuckoo/cuckoo.go	30.86% <0.00%> (-4.94%)	⬇️
p2p/peer.go	75.52% <0.00%> (-1.05%)	⬇️
p2p/server.go	65.52% <0.00%> (ø)
trie/proof.go	72.81% <0.00%> (ø)
ctxc/downloader/downloader.go	75.79% <0.00%> (+0.10%)	⬆️
p2p/discover/v5_udp.go	80.80% <0.00%> (+0.53%)	⬆️
... and 5 more