Check_MK Werk 1703: ups_test: Fix computation of time since last self test

ID: 1703 Title: ups_test: Fix computation of time since last self test Component: Checks & Agents Level: 2 Class: Bug Fix Version: 1.2.5i7 Instead of the time since the last self test of the battery, the check used the time the last test has <i>lasted</i>. So this check did not trigger an alarm every - just for the summary state of the last test. Thanks for the bug report to Cyril Pawelko!