debian scripts use either default db properties (from persist/main/src/resource/db.properties file) or user defined db properties (/etc/minerva/db.properties)

debian scripts use either default db properties (from persist/main/src/resource/db.properties file) or user defined db properties (/etc/minerva/db.properties)

Common code of Debian and RPM packaging has been gathered in
`management_scripts/db_schema_and_diff.sh`.

Closes #218.

tomcat7 is not supported in new debian stretch relase