Fix the netipmid process failed to start

It is not advisable to declare a local variable 'signals' in the
`setupSignal` method, as this can cause the netipmid process to exit
after the method completes execution.

Tested: Loading romulus in qemu and executing out of band ipmitool
successfully returns.

Change-Id: I3fb887db0ec2bfbc434e2a6d8b4f021748ba0a86
Signed-off-by: George Liu <liuxiwei@ieisystem.com>
1 file changed