Initialize label_ and l3_label_ in all forms of RibOutAttr constructor
Initialize label_ and l3_label_ in all forms of RibOutAttr constructor

In some forms, initilization to the integer labels were missing

Change-Id: I7599b051a97cea5499d31f582b50d9bde07687c1
Closes-Bug: 1735560

eonpatapon/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller