Allow finer log level settings

Current situation

Java services do not take into account the DEBUG_LEVEL environment variable to define the display level of their logs. Only INFO level logs are displayed.

Desired outcome

The DEBUG_LEVEL environment variable can increase or decrease the log details.

Possible values would be:

Name	Description
CRITICAL	Only critical messages are shown
ERROR	Only errors and above (CRITICAL) messages are shown
WARNING	Warnings, errors, and critical messages are shown
INFO	Info, warnings, errors, and critical messages are shown
DEBUG	Debug, info, warnings, erros, and critical messages are shown
NOTSET	All messages are shown (including traces if available

The default would be INFO or WARNING.