Figure out what snapshotscli.sh does and if we need it

There is a file in ./server/scripts/cloud-scripts/ called snapshotscli.sh.   We have no documentation about it in the ref guide, and it appears to expose the class 

org.apache.solr.hdfs.snapshots.SolrSnapshotsTool.java

Seems like this should be distributed as part of the hdfs Module, not buried way down deep inside of the core of Solr.  

Maybe it should be in ./modules/hdfs/bin directory?  Or ./modules/hdfs/scripts directory in the Solr distribution?