obexd: Escape semicolons in vCard's fields
obexd: Escape semicolons in vCard's fields

This patch provides possibility to escape only semicolon character
in vCard's fields, as vCard 2.1 specification requires
(for comparision vCard 3.0 requires escaping for set of characters:
'\n', '\r', ';', ',', '\').

pkarasev3/bluez,silent-snowman/bluez,mapfau/bluez,pkarasev3/bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,mapfau/bluez,mapfau/bluez,pkarasev3/bluez,silent-snowman/bluez,mapfau/bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,ComputeCycles/bluez,ComputeCycles/bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez