Default SSH feeds to failure on non-zero result codes

* Override with SshPollConfig.checkSuccess(Predicate)
* failOnNonZeroResultCode methods deprecated
Default shell feeds to failure on non-zero result codes

* Override with ShellPollConfig.checkSuccess(Predicate)
* failOnNonZeroResultCode methods deprecated
Better JavaDoc on deprecated SSH+Shell poll config methods
Update entities using SSH feeds to incorporate non-zero exit codes failing

Touches RedisStoreImpl, MysqlNodeImpl, PostgreSqlNodeImpl and RabbitQueue
Merge pull request #798 from sjcorbett/sshfeed-onsuccess

Default SSH and shell feeds to fail on non-zero result codes