Address build warnings

[jpkrohling]

Signed-off-by: Juraci Paixão Kröhling juraci@kroehling.de

Which problem is this PR solving?

• Clear up build warnings.

Short description of the changes

• For each warning that was being shown, there's one small change either in the code or in the build file.

Before:

$ ./gradlew clean check

> Configure project :
0.29.1-SNAPSHOT

> Task :jaeger-core:compileJava
Note: /mnt/storage/jpkroehling/Projects/src/github.com/jaegertracing/jaeger-client-java/jaeger-core/src/main/java/io/jaegertracing/Configuration.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

> Task :jaeger-core:compileTestJava
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: /mnt/storage/jpkroehling/Projects/src/github.com/jaegertracing/jaeger-client-java/jaeger-core/src/test/java/io/jaegertracing/ConfigurationTest.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

> Task :jaeger-core:test

io.jaegertracing.reporters.RemoteReporterTest > testCloseWhenQueueFull SKIPPED

> Task :jaeger-thrift:compileJava
warning: [options] bootstrap class path not set in conjunction with -source 1.6

> Task :jaeger-zipkin:compileTestJava
Note: /mnt/storage/jpkroehling/Projects/src/github.com/jaegertracing/jaeger-client-java/jaeger-zipkin/src/test/java/io/jaegertracing/zipkin/reporters/ZipkinV2ReporterTest.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
See https://docs.gradle.org/4.7/userguide/command_line_interface.html#sec:command_line_warnings

BUILD SUCCESSFUL in 1m 6s
59 actionable tasks: 47 executed, 12 up-to-date

After:

$ ./gradlew clean check

> Configure project :
0.29.1-SNAPSHOT

> Task :jaeger-core:test

io.jaegertracing.reporters.RemoteReporterTest > testCloseWhenQueueFull SKIPPED

> Task :jaeger-thrift:compileJava
warning: [options] bootstrap class path not set in conjunction with -source 1.6

BUILD SUCCESSFUL in 1m 13s
59 actionable tasks: 42 executed, 17 up-to-date

[codecov]

Codecov Report

Merging #455 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #455      +/-   ##
============================================
- Coverage     88.35%   88.24%   -0.11%     
+ Complexity      489      488       -1     
============================================
  Files            63       63              
  Lines          1846     1846              
  Branches        240      240              
============================================
- Hits           1631     1629       -2     
- Misses          137      139       +2     
  Partials         78       78

Impacted Files	Coverage Δ	Complexity Δ
.../src/main/java/io/jaegertracing/Configuration.java	94.14% <100%> (ø)	39 <0> (ø)	⬇️
...a/io/jaegertracing/propagation/B3TextMapCodec.java	86.53% <0%> (-3.85%)	19% <0%> (-1%)

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