Fixed the reset_stream bug caused by InputParser::exit_parser #3649
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The method exit_parser calls the destructor of the std::thread object (assuming C++11 is present). A thread join or detatch must be performed before this. So, added a check before calling exit_parser in StreamingDenseFeatures and StreamingVwFeatures whether the parser is in running state. If it is, then added a call to end_parser() before calling exit_parser(), which does the thread join.
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The method exit_parser calls the destructor of the std::thread
object (assuming C++11 is present). A thread join or detatch
must be performed before this. So, added a check before calling
exit_parser in StreamingDenseFeatures and StreamingVwFeatures
whether the parser is in running state. If it is, then added a
call to end_parser() before calling exit_parser(), which does
the thread join.