fix #109 add meaningful msg for front service port conflicts

[yaooqinn]

No description provided.

[codecov]

Codecov Report

Merging #111 into master will increase coverage by 1.74%.
The diff coverage is 85.71%.

@@             Coverage Diff              @@
##             master     #111      +/-   ##
============================================
+ Coverage     66.48%   68.23%   +1.74%     
- Complexity      475      489      +14     
============================================
  Files            71       71              
  Lines          3390     3387       -3     
  Branches        487      485       -2     
============================================
+ Hits           2254     2311      +57     
+ Misses          878      820      -58     
+ Partials        258      256       -2

Impacted Files	Coverage Δ	Complexity Δ
...la/yaooqinn/kyuubi/spark/SparkSessionWithUGI.scala	74.74% <ø> (ø)	12 <0> (ø)	⬇️
...er/src/main/scala/yaooqinn/kyuubi/cli/Handle.scala	89.47% <0%> (+36.84%)	12 <0> (+6)	⬆️
...cala/yaooqinn/kyuubi/service/AbstractService.scala	76.66% <100%> (ø)	17 <0> (ø)	⬇️
...n/scala/yaooqinn/kyuubi/cli/HandleIdentifier.scala	65.78% <100%> (+1.5%)	12 <2> (-1)	⬇️
...scala/yaooqinn/kyuubi/server/FrontendService.scala	32.92% <100%> (+15.8%)	17 <0> (+9)	⬆️

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