Update Accumulo-Examples pom to use jdk 11 and latest Accumulo snapshot

Update Accumulo-Examples pom to use jdk 11 and latest Accumulo snapshot. 

Update pom.xml to make use of jdk 11 as well as refer to latest Accumulo snapshot.
Made two minor changes to the Viewer and BulkIngestExample classes also.

-  update pom.xml to refer to Accumulo-2.1.0-SNAPSHOT
-  update pom.xml to use jdk 11
-  update Viewer.java to run with jdk 11
-  add info message to BulkIngestExample class

Closes #68