Check_MK Werk 2097: apc_symmetra: Fixed false alert during self test

ID: 2097 Title: apc_symmetra: Fixed false alert during self test Component: Checks & Agents Level: 1 Class: Bug Fix Version: 1.2.7i1 When performing a self test the check raise an alert that the device is "on battery". The check now checks the self test state and ignores the on battery state during this time. The check has been cleaned up a lot to be more maintainable and modern.