Keep going after a shell "[" a.k.a. "test" fails

This is necessary to actually keep going and finish the
component-specific cleanup in component_test_cmake_out_of_source if
ssl-opt.err is non-empty.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

tests/scripts/all.sh

@@ -527,6 +527,7 @@ pre_setup_keep_going () {
             *[!A-Za-z]"test"|*[!A-Za-z]"test"[!A-Za-z]*) true;;
             "tests/"*) true;;
             "grep "*|"! grep "*) true;;
+            "test "*|"[ "*) true;;
             *) false;;
         esac
     }