Show codecoverage for entire repo

[pjohnst5]

Changing to go test line to include all packages in the repo, not just ones that already have test files.

See this thread for more deets
https://stackoverflow.com/questions/59903169/go-wrong-coverage-when-there-is-no-tests-for-a-package

Example: Before this commit, the coverage for cni was

And now its

Notice that internal.go netconfig.go and others were being ignored before in the coverage report. It's because the cni package had no tests at all, so it was just being left out of the report. Now packages with no tests are being included in the coverage.

[codecov]

Codecov Report

Merging #754 (9560377) into master (3c48a34) will increase coverage by 1.60%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #754      +/-   ##
==========================================
+ Coverage   39.89%   41.49%   +1.60%     
==========================================
  Files          82      141      +59     
  Lines       10858    13461    +2603     
==========================================
+ Hits         4332     5586    +1254     
- Misses       6016     7182    +1166     
- Partials      510      693     +183