moved sequential search logic from transaction layer to sip.create.
moved sequential search logic from transaction layer to sip.create.

This way next hop calculation is gathered in one place (previously
next hop calculation for client transactions was in
transaction.createClientTransaction and for transactionless 'ACK'
in sip.create)

Signed-off-by: Kirill Mikhailov <0f3f7051f127a7dd3500665f861cf9004c9d4d2f@gmail.com>

voxology/sip-server,newpouy/sip.js,kirm/sip.js