Fix port-forwarding not being triggered.

[bmcustodio]

While running skaffold dev to deploy a pod containing some port definitions, I noticed that port-forwardings were not being triggered. Turns out this was happening because...

• ADDED events are currently ignored by the port forwarder's pod watcher; and
• The pod I was deploying was already in the Running phase when the watcher is established; and
• No further events (i.e. of type MODIFIED) were received for that pod (so as to trigger forwarding).

My proposal is that the port forwarder's pod watcher starts taking ADDED events into account.

[codecov-io]

Codecov Report

Merging #1433 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1433      +/-   ##
==========================================
- Coverage   44.56%   44.53%   -0.03%     
==========================================
  Files         112      112              
  Lines        4593     4596       +3     
==========================================
  Hits         2047     2047              
- Misses       2339     2342       +3     
  Partials      207      207

Impacted Files	Coverage Δ
pkg/skaffold/kubernetes/port_forward.go	41.48% <0%> (-1.37%)	⬇️

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[r2d4]

Thanks - looks like I made a bad assumption