SqlCall.commit will no-op when an action is not specified

[abmusse]

Noticed that SqlCall.commit will no-op when options.action is not specified.

Check out the unit test: https://github.com/IBM/nodejs-itoolkit/blob/master/test/unit/SqlCallUnit.js#L113

Looks like iXmlNodeSqlCommit intended to default to rollback as the default action.

I think this should default to commit action instead.

Originally posted by @abmusse in #102 (comment)