ISSUE-683: ReflectionFactory is internal proprietary API and may be removed

[sijie]

Original Issue: apache#683

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Expected behavior

No warnings during build

Actual behavior

[INFO] --- maven-compiler-plugin:2.3.2:testCompile (default-testCompile) @ managed-ledger ---
[INFO] Compiling 30 source files to /Users/masakazu/git/pulsar/managed-ledger/target/test-classes
[WARNING] /Users/masakazu/git/pulsar/managed-ledger/src/test/java/org/apache/zookeeper/MockZooKeeper.java:[81,23] ReflectionFactory is internal proprietary API and may be removed in a future release
[WARNING] /Users/masakazu/git/pulsar/managed-ledger/src/test/java/org/apache/zookeeper/MockZooKeeper.java:[81,58] ReflectionFactory is internal proprietary API and may be removed in a future release

Steps to reproduce

mvn install -DskipTests

System configuration

Pulsar version: master c51eaad
OS: macOS 10.12