JBoss Fuse: bin/status and scripts do not work if debug is enabled

Issue

Its possible to set

export KARAF_DEBUG=1

on the OS shell to enable JPDA (remote debugging) on the JBoss Fuse container.

When KARAF_DEBUG is enabled, the bin/status script fails with

ERROR: transport error 202: bind failed: Address already in use
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [debugInit.c:750]
FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)
Aborted (core dumped)

because the status script starts a new Karaf process which tries to set the same DEBUG parameters that are already used by the JBoss Fuse container.
The issue also occurs with other scripts like a stop script.