portforward for resources with hardcoded namespace

[r2d4]

works for cases like

apiVersion: v1
kind: Pod
metadata:
  name: something
  namespace: something

[codecov-io]

Codecov Report

Merging #1223 into master will increase coverage by 0.01%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #1223      +/-   ##
==========================================
+ Coverage   41.48%   41.49%   +0.01%     
==========================================
  Files          95       95              
  Lines        4233     4234       +1     
==========================================
+ Hits         1756     1757       +1     
  Misses       2307     2307              
  Partials      170      170

Impacted Files	Coverage Δ
pkg/skaffold/kubernetes/port_forward.go	37.63% <33.33%> (+0.67%)	⬆️

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[priyawadhwa]

LGTM