Do not recreate container when scale resource

[supermeng]

Fix issue #51

[codecov]

Codecov Report

Merging #52 into master will decrease coverage by 0.89%.
The diff coverage is 75%.

@@            Coverage Diff            @@
##           master      #52     +/-   ##
=========================================
- Coverage   49.44%   48.54%   -0.9%     
=========================================
  Files          20       20             
  Lines        3578     3646     +68     
=========================================
+ Hits         1769     1770      +1     
- Misses       1627     1691     +64     
- Partials      182      185      +3

Impacted Files	Coverage Δ
engine/specs.go	53.19% <ø> (-1.84%)	⬇️
engine/config.go	31.57% <ø> (ø)	⬆️
engine/runtimes.go	31.25% <ø> (-1.17%)	⬇️
engine/podgroup.go	48.08% <44.44%> (-1.2%)	⬇️
engine/podgroup_ops.go	42.22% <83.33%> (-7.27%)	⬇️
engine/pod.go	61.69% <85%> (+1.2%)	⬆️
... and 1 more

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