[Bug 790752] msdk: supports bufferpool

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790752

--- Comment #119 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 368297
  --> https://bugzilla.gnome.org/attachment.cgi?id=368297&action=edit
msdk: context: add job type to figure out if joining  session is necessary

According to the driver's instruction, if there are two or more encoders
or decoders in a process, the session should be joined by MFXJoinSession.

To achieve this successfully by GstContext, this patch adds job type
specified if it's encoder, decoder or vpp.

If a msdk element gets to know if joining session is needed by the shared
context,
it should create another instance of GstContext with joined session, which
is not shared.

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