Close port forwards on the activate loop

[rberrelleza]

Proposed changes

• Properly close the SSH port-forwards on the activate loop

[codecov]

Codecov Report

Merging #1149 into master will increase coverage by 0.22%.
The diff coverage is 58.49%.

@@            Coverage Diff             @@
##           master    #1149      +/-   ##
==========================================
+ Coverage   33.90%   34.13%   +0.22%     
==========================================
  Files          65       65              
  Lines        5450     5467      +17     
==========================================
+ Hits         1848     1866      +18     
+ Misses       3403     3398       -5     
- Partials      199      203       +4     

Impacted Files	Coverage Δ
cmd/up/up.go	3.96% <0.00%> (-0.01%)	⬇️
pkg/ssh/pool.go	52.83% <46.15%> (+0.65%)	⬆️
pkg/ssh/reverse.go	55.00% <46.66%> (-4.46%)	⬇️
pkg/ssh/forward.go	72.72% <68.42%> (+20.22%)	⬆️
pkg/ssh/manager.go	63.46% <100.00%> (+3.46%)	⬆️

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