Feature/gh 77 scale a container on gke

[loicalbertin]

Pull Request description

Description of the change

Implement a custom operation that allows to scale a k8s container deployment unit.

What I did

• Implement scaling within the k8s integration
• Support custom command with interfaces names different from custom

Applicable Issues

PR ystia/yorc-a4c-plugin#66 is required

Fixes #77

[codecov]

Codecov Report

Merging #190 into develop will increase coverage by 0.04%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop     #190      +/-   ##
===========================================
+ Coverage    42.47%   42.52%   +0.04%     
===========================================
  Files          144      144              
  Lines        13247    13253       +6     
===========================================
+ Hits          5627     5636       +9     
+ Misses        6752     6749       -3     
  Partials       868      868

Impacted Files	Coverage Δ
rest/structs.go	14.28% <ø> (ø)	⬆️
rest/dep_custom.go	0% <0%> (ø)	⬆️
tasks/workflow/task_execution.go	0% <0%> (ø)	⬆️
tasks/workflow/worker.go	1.76% <0%> (-0.03%)	⬇️
prov/monitoring/monitoring_mgr.go	62.96% <0%> (ø)	⬆️
prov/scheduling/scheduler/scheduler.go	83.18% <0%> (+7.96%)	⬆️

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[laurentganne]

looks good