Don't print license when initiating gdb from testall script

Signed-off-by: Lars Erik Wik <lars.erik.wik@northern.tech>

Author: larsewi

tests/acceptance/testall

@@ -483,7 +483,7 @@ export CFENGINE_TEST_OVERRIDE_WORKDIR TEMP CFENGINE_TEST_OVERRIDE_EXTENSION_LIBR
             then
                 printf "\"$LIBTOOL\" --mode=execute " >> "$WORKDIR/runtest"
             fi
-            printf "gdb --args " >> "$WORKDIR/runtest"
+            printf "gdb -silent --args " >> "$WORKDIR/runtest"
         fi
 
         if [ -n "$USE_VALGRIND"  -a  $TEST_TYPE = errorexit ]