qisys: add write_file_if_different, use it in configure_file
qisys: add write_file_if_different, use it in configure_file

Change-Id: Ibab837d6132521ee1a85bff5fddb2c2bcaee306a
Reviewed-on: http://gerrit.aldebaran.lan/19551
Reviewed-by: dmerejkowsky <1e4b13000fa8777df4cefd2fd8215187e3deb062@aldebaran-robotics.com>
Tested-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>

dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild