Add connection close at the end of inventory sync

[kedark3]

Problem

During our usage of Ansible Tower and Inventory Sync operations against RHV we saw following:

1- We do inv sync frequently
2- Our RHV had sessions timeout after an hour
3- so it held onto all connections in the db and JVM (java )
4- connections pile up

This connection piling up is not good for environment as it uses resources unnecessarily.

It is important we close out connection at the end.

Solution

Close the connection at the end of sync.

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[mnecas]

ci test please

[mnecas]

LGTM

[kedark3]

@mnecas thanks for quick merge.