do some cleanup work fo vm accelerator

patch 1/3: skip init accelerator if it's not available
patch 2/3: correct error message when fail to init kvm
patch 3/3: change {xen,kvm,tcg,qtest}_allowed from int to bool

 hw/xen.h               |    4 +-
 include/sysemu/kvm.h   |    2 +-
 include/sysemu/qtest.h |    2 +-
 qtest.c                |    2 +-
 vl.c                   |   40 ++++++------
 5 files changed, 26 insertions(+), 24 deletions(-)

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