Error in logs during Karaf startup

Issue

• On all UNIX OS (RHEL, Solaris, AIX), getting errors in the log during startup because SIGHUP is already handled by our executable:

07 Jul 2017 11:10:33,237 | main | org.apache.karaf.main.Main.startKarafActivators(Main.java:386) | Error starting karaf activator org.apache.karaf.diagnostic.core.internal.Activator: Signal restricted by VM: HUP07 Jul 2017 11:10:33,258 | main | org.apache.karaf.main.Main.startKarafActivators(Main.java:386) | Error starting karaf activator org.apache.karaf.diagnostic.core.internal.Activator: Signal restricted by VM: HUP

• This has no consequence on the functionality, karaf starts properly.