Reproduction steps:
1. dnf install odcs-client
2. odcs --help

Results: Traceback (most recent call last):
File "/usr/bin/odcs", line 10, in <module>
import odcs.client.odcs
File "/usr/lib/python2.7/site-packages/odcs/client/odcs.py", line 29, in <module>
from requests_kerberos import HTTPKerberosAuth
ImportError: No module named requests_kerberos

ODCS client expects the requests_kerberos python module to be available, but when installing the rpm, it doesn't seem to have python-requests-kerberos as a Requires, thus I needed to install that separately.