Update documentation for settting/getting log level using provided scripts

[quinarygio]

Documentation is not updated for usage of scripts in src/test/resources/logs: getLogsNodeService.sh getLogs.sh setLogsNodeService.sh setLogs.sh

The parameter is not documented

Es: ./setLogs.sh

Usage : setLogs.sh host:port level user password opfab_url

While in documentation:

To set the log level for ROOT logger of a service it is possible to call the provided script
https://github.com/opfab/operatorfabric-core/tree/master/src/test/resources/logs/setLogs.sh[src/test/resources/logs/setLogs.sh] as follows: setLogs.sh <server:port> <log_level> <user> <opfab_url>. For example to set the log level to DEBUG for "card-publication" service execute: setLogs.sh localhost:2102 DEBUG admin http://localhost