VT: Add control of base jitter dynamics

[Problem] Assembler regards many normal packets as "too late"
[Cause] Legacy base(static) jitter was only good at good N/W case.
[Solution] Change base jitter not to be static anymore.
           Apply dynamic concept for base jitter also.

Now jitter buffer is composed of 3 sub jitter buffers.

                ┌- static - Given static minimum time
                │           that waits to complete a NAL.
                │
Jitter Buffer --+- base - Major propagation time of the N/W.
                │         So its dynamics depends on N/W state.
                │         This would major jitter buffer time
                │         that waits to complete a NAL.
                │
                └- inter arrival - A variance of
                                   arrival times of packets / NALs.
                                   Refered formula defined in RFC3550.

Bug: 188504024

Change-Id: I0df19095da6efd3f496234a5e6e7e3f38ee353a7
Signed-off-by: Kim Sungyeon <sy85.kim@samsung.com>