Make build faster by reducing fixed waiting time in tests

[aalmiray]

Describe what this PR does / why we need it

Makes build times faster by reducing the time some tests have to wait.

Does this pull request fix one issue?

Fixes #416

Describe how you did it

https://github.com/awaitility/awaitility is applied instead of fixed waiting times using of Thread.sleep()

Describe how to verify it

Without this a normal build takes approximately 3:46minutes.
With this fix a normal build takes approximately 1:16minutes.

Special notes for reviews

You can see the build times on OracleJDK8 and OracleJDK11 at https://travis-ci.org/aalmiray/Sentinel
Code produced during Hackergarten Basel 24.01.2019 http://hackergarten.net/

[CLAassistant]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #449 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #449      +/-   ##
============================================
+ Coverage     37.72%   37.76%   +0.04%     
- Complexity      982      984       +2     
============================================
  Files           235      235              
  Lines          7409     7409              
  Branches       1016     1016              
============================================
+ Hits           2795     2798       +3     
+ Misses         4253     4246       -7     
- Partials        361      365       +4

Impacted Files	Coverage Δ	Complexity Δ
...a/com/alibaba/csp/sentinel/eagleeye/StatEntry.java	20.21% <0%> (+2.12%)	8% <0%> (+1%)	⬆️
...alibaba/csp/sentinel/eagleeye/StatRollingData.java	73.52% <0%> (+2.94%)	9% <0%> (+1%)	⬆️

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[sczyh30]

LGTM

[sczyh30]

Awesome, thanks for contributing! 👍