Remove no username error messages (#286)

[AlexGraberTilton]

Fixes #286

Summary

Removes the error messages that occur during some valid use cases, such as when the /etc/passwd file does not have an entry for a uid + gid due to running in docker with --user uid:gid

Signed-off-by: Alexander Graber-Tilton [email protected]

[codecov]

Codecov Report

Merging #291 (37234b4) into ign-transport8 (c6abe3d) will increase coverage by 0.06%.
The diff coverage is 100.00%.

❗ Current head 37234b4 differs from pull request most recent head 3f645e8. Consider uploading reports for the commit 3f645e8 to get more accurate results

@@                Coverage Diff                 @@
##           ign-transport8     #291      +/-   ##
==================================================
+ Coverage           83.76%   83.82%   +0.06%     
==================================================
  Files                  51       51              
  Lines                5033     5034       +1     
==================================================
+ Hits                 4216     4220       +4     
+ Misses                817      814       -3     

Impacted Files	Coverage Δ
include/ignition/transport/Discovery.hh	87.94% <ø> (+0.20%)	⬆️
src/NetUtils.cc	74.07% <ø> (+1.34%)	⬆️
src/NodeSharedPrivate.hh	100.00% <ø> (ø)
src/Discovery.cc	77.77% <100.00%> (+2.77%)	⬆️
src/NodeShared.cc	78.95% <100.00%> (+0.05%)	⬆️

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