eliminate random int on schema creation (fallback to topic…

[Freshwood]

This pull request will resolve issue #145

Instead of randomly set a schema name on every query, just take the name of the topic which. This will fix the following behaviors:

• Schema name correspond with topic name.
• will prevent schema topic overwrite when user start a sync with a different topic
• will prevent error on too much schema versions created

This pull request was already tested on a real HANA database and everything was fine.

[cla-assistant[bot]]

All committers have signed the CLA.

[elakito]

thanks!