Description of problem:
Unit ovn-northd.service could not be found when install ovn2.12-central and ovn2.12-host

Version-Release number of selected component (if applicable):
ovn2.12-central-2.12.0-7.el7fdp.x86_64

How reproducible:
Always

Steps to Reproduce:
1. install ovn2.12-central
2.
3.

Actual results:
Unit ovn-northd.service could not be found.

Expected results:
no error

Additional info:


[root@kvm-04-guest21 2.12]# rpm -ivh ovn2.12-central-2.12.0-7.el7fdp.x86_64.rpm                       
Verifying...                          ################################# [100%]                        
Preparing...                          ################################# [100%]                        
Unit ovn-northd.service could not be found.                                                           
Updating / installing...                                                                              
   1:ovn2.12-central-2.12.0-7.el7fdp  ################################# [100%]                        
[root@kvm-04-guest21 2.12]# rpm -ivh ovn2.12-host-2.12.0-7.el7fdp.x86_64.rpm                          
Verifying...                          ################################# [100%]                        
Preparing...                          ################################# [100%]
Unit ovn-controller.service could not be found.
Updating / installing...                                                                              
   1:ovn2.12-host-2.12.0-7.el7fdp     ################################# [100%]