Add tests for mentions, favoriteMessage and servers module

[GOVINDDIXIT]

This PR is specific to GSoC'19 project (Improve test automation in Rocket.Chat Android Repo)

Change Log

• Add UI tests for the mentions module
• Add UI test for the favorite message module
• Add UI tests for servers module
• Add unit tests for servers module
• Fix naming of unit tests

Current Code coverage: 35% by Instructions 19% by branch

[codecov]

Codecov Report

Merging #13 into develop will increase coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             develop     #13      +/-   ##
============================================
+ Coverage       0.45%   0.51%   +0.05%     
- Complexity        21      25       +4     
============================================
  Files            321     321              
  Lines          10456   10456              
  Branches        1821    1821              
============================================
+ Hits              48      54       +6     
+ Misses         10388   10382       -6     
  Partials          20      20

Impacted Files	Coverage Δ	Complexity Δ
app/src/main/java/testConfig/Config.kt	0% <ø> (ø)	0 <0> (ø)	⬇️
...t/android/servers/presentation/ServersPresenter.kt	40% <0%> (+40%)	4% <0%> (+4%)	⬆️

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[ear-dev]

This all worked great! Approved.