[Bug 747595] tests: Add test suite for alpha element

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747595

--- Comment #1 from RaviKiran <ravi.kiran at samsung.com> ---
Created attachment 301252
  --> https://bugzilla.gnome.org/attachment.cgi?id=301252&action=edit
test suite for alpha

Added alpha test suite with unit tests for -
1. alpha
2. Chroma keying

Please review

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