[Repo/RNN] Add dummy RNN test case

[Repo/RNN] Add dummy RNN test case

In order to test recurtion & Tensor repo, dumm RNN test case is added.

It generate 10 4x4x4x1 tensors and use first input of RNN. Second
input for RNN is generated by tensor_reposrc which take from
Tensor_Repo. Of course, the first tensor of tensor_reposrc is filled
with zero. After simple calcution,
RNN (build/nnstreamer_exampel/custom_exampe_RNN/libdummyRNN.so ) push
the result and tensor_reposink upload this output into Tensor_Repo.

**Self evaluation:**
1. Build test:	 [X]Passed [ ]Failed [ ]Skipped
2. Run test:	 [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: jijoong.moon <jijoong.moon@samsung.com>