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Setup tango sighandler before the calling MPI_Init

Samuel Debionne requested to merge fix-tango-sighandler into develop

The Tango device server would not cleanup properly and return with error code 2 (or 130 (128+2) in bash):

^C[mpiexec@lid00lima2] Sending Ctrl-C to processes as requested
[mpiexec@lid00lima2] Press Ctrl-C again to force abort

===================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   PID 3069990 RUNNING AT lid00lima2
=   EXIT CODE: 2
=   CLEANING UP REMAINING PROCESSES
=   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
===================================================================================
YOUR APPLICATION TERMINATED WITH THE EXIT STRING: Interrupt (signal 2)
This typically refers to a problem with your application.
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