Steps:
1. deploy current koji from master upstream
2. error
2019-03-01 08:26:21,765 [ERROR] koji: HTTPError: 500 Server Error: Internal Server Error for url: https://10.8.242.253/kojihub
2019-03-01 08:26:22,134 [ERROR] koji: HTTPError: 500 Server Error: Internal Server Error for url: https://10.8.242.253/kojihub/ssllogin
2019-03-01 08:26:22,509 [ERROR] koji: HTTPError: 500 Server Error: Internal Server Error for url: https://10.8.242.253/kojihub/ssllogin

and in the /var/log/httpd/error_log is:

mod_wsgi (pid=19218): Failed to exec Python script file '/usr/share/koji-hub/kojixmlrpc.py'.
mod_wsgi (pid=19218): Exception occurred processing WSGI script '/usr/share/koji-hub/kojixmlrpc.py'.
Traceback (most recent call last):
File "/usr/share/koji-hub/kojixmlrpc.py", line 36, in <module>
import koji.db
File "/usr/lib/python3.7/site-packages/koji/db.py", line 26, in <module>
import psycopg2
ModuleNotFoundError: No module named 'psycopg2'

Expected result:
add python3-psycopg2 to the koji.spec