ACCUMULO-3643 Catch findbugs up through rank 14

Triaged all findbugs issues at the "troubling" ranks.

These included:
possible null pointer dereferences,
possible concurrency correctness issues,
subclass simple name shadowing, and
missing hashCode implementations for equals.

Added minor fixes or explicitly documented exclusions on things which looked
okay. Added exclusion file to each module to simplify pom configuration for
findbugs-maven-plugin and to make it easier for future issues to be added after
triage.
1 file changed
tree: f2d13725dda7ac95719d8667119bf503e87ce506
  1. src/
  2. .gitignore
  3. pom.xml