ACCUMULO-4304 Replace Guava use w/built-ins

Replace functional guava stuff, some predicates, optional, and base-64
classes with Java 8 built-in stuff.
1 file changed
tree: 5246190471b87f9e4821f9e0ee8fc7d2d8da7c96
  1. src/
  2. .gitignore
  3. pom.xml