commons.db.connection.useSsl setting not honored

[lorthirk]

Describe the bug
Despite using commons.db.connection.useSsl, such setting is not used when building the JDBC connection string

To Reproduce
Steps to reproduce the behavior:

1. Set commons.db.connection.useSsl from one of the configured settings source
2. Start Kapua and wait for a SQL DB connection to a DB that only allows SSL connections
3. Kapua reports an error

Expected behavior
Kapua should be able to connect to a SSL database

Screenshots
N/A

Version of Kapua
1.0.7

Type of deployment
[x] Local Vagrant deployment
[x] Docker
[x] Openshift (in its variants)
[x] Others

Main component affected
[x] Console (in case of console please report info on which browser you encountered the problem)
[x] REST API
[x] Message Broker
[x] - Others