eth/downloader: bypass peer validation if remote peer is far away

[manav2401]

Don't stop sync if remote peer is far away (1024 blocks for now)

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (v1.2.7-beta2-candidate@7d39405). Click here to learn what that means.

Files	Patch %	Lines
eth/downloader/downloader.go	72.72%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@                    Coverage Diff                    @@
##             v1.2.7-beta2-candidate    #1167   +/-   ##
=========================================================
  Coverage                          ?   55.96%           
=========================================================
  Files                             ?      658           
  Lines                             ?   114495           
  Branches                          ?        0           
=========================================================
  Hits                              ?    64073           
  Misses                            ?    46573           
  Partials                          ?     3849           

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