[Bug 788759] qtdemux: fix 'stsd' table leak and nested caps leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788759

--- Comment #6 from Jun Xie <jun.xie at samsung.com> ---
after digging more, IMHO, QtDemuxStream needs to be reset if reused.

'gst_qtdemux_stream_reset' is newly added, it does:
 1. clear stream 
 2. free stsd entries, and its nested caps

please review.

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