[Sunstone] Time configuration

[dann1]

SEE THIS RELATED ISSUE #6254

Description
The sunstone-server.conf file allows changing the timezone configuration Sunstone uses. As of now, that setting does nothing. The timestamps displayed use the browser configuration.

To Reproduce

• Set a timezone different from the one in your browser at /etc/one/fireedge/sunstone/sunstone-server.conf by changing the parameter currentTimeZone
• Restart fireedge
• That timezone isn't applied

Expected behavior
Sunstone should be able to set both timezone configuration and date format (24h/am-pm). To minimize configuration, there should be two behaviors

• set time configuration from browser environment (current behavior)
• set time configuration from OS env (where the fireedge server is running)
  • should be the new behaviour.

Details

• Version: 7.0

Additional context
For the OS, this configuration can be applied as follows

timedatectl set-timezone UTC
localectl set-locale LC_TIME=C.UTF-8

Progress Status

• Code committed
• Testing - QA
• Documentation (Release notes - resolved issues, compatibility, known issues)