h264dec: drain dpb (output all pictures) upon EOS
h264dec: exception handling in flushOutport/decodeSequenceEnd

1. when there is error occured before, flushOutport/decodeSequenceEnd
   needs handle exception, for example m_DPBManager hasn't initialized yet.
2. drainDPB should happen regardless current picture decoding succeed or not.
3. include config.h of parsers for logs

sign-off-by: Zhao, Halley <halley.zhao@intel.com>
             Wei, ChangzhiX <changzhix.wei@intel.com>
h264dec: fix spliteFields for PAFF

for picture-adaptive frame-fields, when we build a ref list for field, we
need splite frame to fields. and seconds field need inherit first fields's
poc and reference states (short or long).