Use dedicated name for split and merge tasks

[activeeon-bot]

Original issue created by Laurent Pellegrino on 11, Jun 2015 at 18:15 PM - PRC-60

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Currently, all tasks are named using the same pattern "tX" where X is a sequence ID. It would be nice to put the word 'split' and 'merge' for associated type of tasks. This way, a user can easily see from the scheduler portal or the console if a job was involving a split and or a merge.

I think this small improvement is also interesting for introducing the connector so that people can easily get the idea when jobs are showed from the scheduler portal.