tests: fix expect tests and add EOF linter

[algorandskiy]

Summary

While looking why #6089 expect test did not work as expected, I found it copied the expect statement from the CheckNetworkAddressForCors function, and it does not perform check correctly ignoring the fact of missing expected output.
I fixed that by added eof sub statement which is hit when no other statement executed previously and when there is no exp_continue. After that the test started failing since it was checking KMD headers without setting allowed_origins configuration option.

@cce also discovered the same issue in some other tests and added a linter.

Test Plan

This is a test fix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.20%. Comparing base (0da0e99) to head (07aaf5a).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6122      +/-   ##
==========================================
- Coverage   56.22%   56.20%   -0.03%     
==========================================
  Files         494      494              
  Lines       69921    69921              
==========================================
- Hits        39313    39299      -14     
- Misses      27941    27954      +13     
- Partials     2667     2668       +1     

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[algorandskiy]

some eofs looks exceeding because of variables checking after the expect statement but does not hurt

[gmalouf]

Added 1 ask in Makefile - is the idea that eof wasn't being called in some corner cases/we ended up with false positives?