Feature/include cpu profiling and memory profiling

[githubsands]

Easily create pprof memory or cpu profiles by using a flag.

--cpuprofile="filename"
--memprofile="filename"

[codecov]

Codecov Report

Merging #414 into master will increase coverage by 0.04%.
The diff coverage is 51.72%.

@@            Coverage Diff            @@
##           master    #414      +/-   ##
=========================================
+ Coverage   71.96%     72%   +0.04%     
=========================================
  Files         202     202              
  Lines       11842   11871      +29     
=========================================
+ Hits         8522    8548      +26     
+ Misses       2644    2642       -2     
- Partials      676     681       +5

Impacted Files	Coverage Δ
server/viper.go	82.41% <51.72%> (-14.36%)	⬇️
device/manager.go	57.93% <0%> (+0.39%)	⬆️
device/drain/drainer.go	96.96% <0%> (+1.51%)	⬆️
device/device.go	65.51% <0%> (+1.72%)	⬆️
service/consul/instancer.go	74.52% <0%> (+4.71%)	⬆️

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