Fix/race condition

[Dexus]

I need at last three reviews, thank you.

To merge and fix #39

[godofdream]

Why do you replace the logger? logrus is nice but definitly not the fastest logger. I'm using e.g. zap.

[Dexus]

I have took the changes from Iris/Ion. I did not know zap, but that would be a very good alternative.

[godofdream]

logrus is nice but definitly not fast, see some benchmarks: https://github.com/uber-go/zap

[Dexus]

Okay, then I'll remove logrus and add Zap.

Any hints for zap, as i use it the first time?

[codecov[bot]]

Codecov Report

Merging #44 into devel will increase coverage by 4.93%. The diff coverage is 49.15%.

@@            Coverage Diff             @@
##            devel      #44      +/-   ##
==========================================
+ Coverage   47.74%   52.67%   +4.93%     
==========================================
  Files          22       18       -4     
  Lines        1240     1232       -8     
==========================================
+ Hits          592      649      +57     
+ Misses        616      542      -74     
- Partials       32       41       +9

Impacted Files	Coverage Δ
core/host/proxy.go	73.8% <ø> (ø)	:arrow_up:
core/nettools/server.go	0% <0%> (ø)	:arrow_up:
core/nettools/addr.go	68.85% <100%> (+42.12%)	:arrow_up:
core/errors/reporter.go	13.51% <13.51%> (ø)
core/errors/errors.go	46.77% <50%> (-9.64%)	:arrow_down:
core/host/task.go	57.89% <62.5%> (+13.99%)	:arrow_up:
core/host/supervisor.go	63.77% <66.66%> (+7.38%)	:arrow_up:
core/host/world.go	75% <75%> (ø)
... and 2 more

---

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Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update d57779a...91ddbc2. Read the comment docs.

[codecov-io]

Codecov Report

Merging #44 into devel will increase coverage by 7.93%. The diff coverage is 52.94%.

@@            Coverage Diff             @@
##            devel      #44      +/-   ##
==========================================
+ Coverage   47.74%   55.68%   +7.93%     
==========================================
  Files          22       18       -4     
  Lines        1240     1232       -8     
==========================================
+ Hits          592      686      +94     
+ Misses        616      507     -109     
- Partials       32       39       +7

Impacted Files	Coverage Δ
core/host/proxy.go	73.8% <ø> (ø)	:arrow_up:
core/nettools/server.go	0% <0%> (ø)	:arrow_up:
core/nettools/addr.go	80.32% <100%> (+53.6%)	:arrow_up:
core/errors/reporter.go	13.51% <13.51%> (ø)
core/host/task.go	57.89% <62.5%> (+13.99%)	:arrow_up:
core/host/supervisor.go	63.77% <66.66%> (+7.38%)	:arrow_up:
core/errors/errors.go	83.87% <73.68%> (+27.46%)	:arrow_up:
core/host/world.go	75% <75%> (ø)
... and 3 more

---

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Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update d57779a...1fc1d8c. Read the comment docs.

[Dexus]

@godofdream can you now again review? Zap is added and the "newline" is also added... but it should never used only when created a new error from /core/errors with any Append function on it.