[HBASE-21567] Allow overriding configs starting up the shell - ASF JIRA

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Allow passing of -Dkey=value option to shell to override hbase-* configuration: e.g.:

$ ./bin/hbase shell -Dhbase.zookeeper.quorum=ZK0.remote.cluster.example.org,ZK1.remote.cluster.example.org,ZK2.remote.cluster.example.org -Draining=false
...
hbase(main):001:0> @shell.hbase.configuration.get("hbase.zookeeper.quorum")
=> "ZK0.remote.cluster.example.org,ZK1.remote.cluster.example.org,ZK2.remote.cluster.example.org"
hbase(main):002:0> @shell.hbase.configuration.get("raining")
=> "false"

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Allow passing of -Dkey=value option to shell to override hbase-* configuration: e.g.: $ ./bin/hbase shell -Dhbase.zookeeper.quorum=ZK0.remote.cluster.example.org,ZK1.remote.cluster.example.org,ZK2.remote.cluster.example.org -Draining=false ... hbase(main):001:0> @shell.hbase.configuration.get("hbase.zookeeper.quorum") => "ZK0.remote.cluster.example.org,ZK1.remote.cluster.example.org,ZK2.remote.cluster.example.org" hbase(main):002:0> @shell.hbase.configuration.get("raining") => "false"

Needed to be able to point a local install at a remote cluster. I wanted to be able to do this:

${HBASE_HOME}/bin/hbase shell -Dhbase.zookeeper.quorum=ZK0.remote.cluster.example.org,ZK1.remote.cluster.example.org,ZK2.remote.cluster.example.org

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