Prevent a shutdown hook from being removed in JaegerTracer when a shutdown is in progress

[TomasHofman]

Prevent a shutdown hook from being removed in JaegerTracer when a shutdown is in progress

Signed-off-by: Tomas Hofman thofman@redhat.com

Which problem is this PR solving?

This is follow up PR for #679

The problem this PR is solving that when a JaegerTracer is closed as a result of shutdown, the attempt to remove its' close shutdown hook fails with IllegalStateException. I.e. the shutdown hook cannot be removed when shutdown is already in progress.

Short description of the changes

Do not remove a shutdown hook when a shutdown is already in progress.

[codecov]

Codecov Report

Merging #689 into master will increase coverage by 0.38%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #689      +/-   ##
============================================
+ Coverage     89.46%   89.85%   +0.38%     
- Complexity      567      570       +3     
============================================
  Files            69       69              
  Lines          2089     2090       +1     
  Branches        267      267              
============================================
+ Hits           1869     1878       +9     
+ Misses          137      131       -6     
+ Partials         83       81       -2

Impacted Files	Coverage Δ	Complexity Δ
...n/java/io/jaegertracing/internal/JaegerTracer.java	89.07% <100%> (+1.06%)	27 <0> (+1)	⬆️
...gertracing/internal/reporters/LoggingReporter.java	90.9% <0%> (+9.09%)	5% <0%> (+1%)	⬆️
...rtracing/internal/reporters/CompositeReporter.java	100% <0%> (+28.57%)	7% <0%> (+1%)	⬆️

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