systemc: Make some tests use cout instead of cerr to report completion.

cerr goes to simerr, but we compare simout against the golden output.

Change-Id: I9270866a92dd06a23d47c1964dacc4872030f30d
Reviewed-on: https://gem5-review.googlesource.com/c/12470
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

systemc: Remove more Accellera source specific include paths in tests.

Some more tests were including Accellera headers specifically, even
after including systemc.h which would bring those headers in alongside
all the others.

Change-Id: Ib2db0a410e0ecea0035b636e8dd04c85045b8578
Reviewed-on: https://gem5-review.googlesource.com/11179
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

systemc: Import tests from the Accellera systemc distribution.

Change-Id: Iad76b398949a55d768a34d027a2d8e3739953da6
Reviewed-on: https://gem5-review.googlesource.com/10845
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>