Enforce JDK 7 signatures only
Enforce JDK 7 signatures only

This commit adds usage of the animal-sniffer-maven-plugin to ensure that
compiled artifacts are only using signatures from JDK 7. This addresses
an issue where many developers are using JDK 8 locally.

Closes #16462

strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test