[IDEA] Make "database" the default for configurationmap.location

[joshmc82]

Is your feature request related to a problem? Please describe.
Now that Mirth Connect supports using the database for storing the configurationMap data, that should be the default behavior.

Describe your use case
It makes failover and recover a lot easier if I don't have to care about the file system I've installed on. This is also a critical change for containerized instances.

Describe the solution you'd like
Add configurationmap.location=database to the default mirth.properties file

Describe alternatives you've considered
Manually add it during every deployment before setting up the environment

Additional context
N/A

[jonbartels]

@joshmc82 I have a branch on my fork for this change. I have not tested it locally yet. Ran out of motivation before the build completed.

Opinions and code reviews welcome - https://github.com/jonbartels/connect/tree/5746-configmap-to-db-default

The getString(property, default) is a better pattern than the old way of doing null checks.

I kind of want to change it to use StringUtils.equals instead of yoda conditions.