catchpointdump: support p2p nodes

[algorandskiy]

Summary

1. Allow catchpointdump utility to download catchpoint files from p2p archival nodes
2. Fixed a typo in checkLedgerDownload

Test Plan

Tested manually

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 18 lines in your changes missing coverage. Please review.

Project coverage is 51.80%. Comparing base (f468e57) to head (45e08fb).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/catchpointdump/net.go	0.00%	15 Missing ⚠️
catchup/catchpointService.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6266      +/-   ##
==========================================
+ Coverage   49.77%   51.80%   +2.03%     
==========================================
  Files         644      644              
  Lines       86644    86655      +11     
==========================================
+ Hits        43123    44893    +1770     
+ Misses      40608    38898    -1710     
+ Partials     2913     2864      -49     

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