The os_ken/services/protocols/bgp/api/jsonrpc.py module was using
os_ken/app and os_ken app is the only one which was using tinyrpc lib.
Modules under os_ken/app except os_ken/app/ofctl are not used in neutron
and neutron-dynamic-routing so lets drop them from the code.
With that we can also drop tinyrpc from the requirements file at all.
Task: #41912
Story: #2008648
Change-Id: Ic35d1f7ee4112bc5cf16fee3d828534ded26ce7f
cd4926b235