BSC_ConnectionHandler.ttcn: split up f_mo_sms() into two functions

This would allow to submit an SMS message using f_mo_sms_submit()
and wait for RP-ACK using f_mo_sms_wait_rp_ack() separately in the
follow-up changes for SMS over GSUP.

Change-Id: I5b35206286ae8add8b5bd34b0ab41ba7862c28e4
1 file changed