Inspect: fixes all, by name and topology file

[steiler]

This should fix #1982 and fix #1958

[steiler]

This is still an intermediate solution. We should not need to instantiate a clab instance to query nodes by a random label...
But for now is does the trick.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.63%. Comparing base (0a94452) to head (e673bdc).
Report is 2 commits behind head on main.

❗ Current head e673bdc differs from pull request most recent head 523834d. Consider uploading reports for the commit 523834d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1984      +/-   ##
==========================================
- Coverage   53.64%   53.63%   -0.01%     
==========================================
  Files         160      160              
  Lines       11538    11536       -2     
==========================================
- Hits         6189     6187       -2     
  Misses       4485     4485              
  Partials      864      864              

Files	Coverage Δ
clab/clab.go	70.22% <100.00%> (ø)
clab/hostsfile.go	61.03% <100.00%> (ø)
cmd/inspect.go	83.07% <100.00%> (-0.26%)	⬇️