Revert the commits for RPC-zing the t_uac_dlg
The RPC-zing will be added internally to t_uac() function, transparent for the code using it.
Re-implement t_uac() to do RPC if local_route cannot be locally run
IF triggered from MI or non-SIP processes, the t_uac() cannot run local route (as such procs do not have the script anymore).
Instead of various fixes in different parts of code / modules, let's address the problem internally in t_uac() - if needed and script is not available, run local route via RPC (while doing busy waiting)