CI: Database-check: create dummy OPENFIRE_HOME
The original code expects files to exist in a certain relative position (which isn't the case on GitHub). Instead, the required files are now created.
CI: database update should start with newer script
The database update test performed by continuous integration should start with version 4.2.0 of the database, instead of an older one.
In 4.2.0, a column was added to the ofProperty table (`encrypted`) that is used by the Java code that performs the test.
