Simplify CMakeLists test file

Change-Id: I75095741d7f39e98ea3b410e9c7dab9407432040
agnosticbin3: Add skelleton classes

Change-Id: I1e02a6e4e417455a9909956c2c059eabd4890f1b
kmsagnosticbin3: Add pad templates

Change-Id: I42fc58f42470bb270e015205d6086239081ee86b
kmsagnosticbin3: Create sink pads

Change-Id: I4bf6de697011a48e90821598dc37c5b374026198