* make gtp_ntoa() public after renaming it to sgsn_gtp_ntoa() to avoid confusion with libgtp functions * use it to log GTP-U endpoints address updates Change-Id: I96d0f3a63cce338471cc39cc33fd44c39cd2aa73 Related: SYS#3610
Change-Id: I281ef585fffc2644682c8282224fb1c2da5ca795