Description of problem:
The sss_cache utility performs cleanups of the SSSD cache. Currently there is no option to clear the cached sudo rules.


Version-Release number of selected component (if applicable):
sssd-1.9.2-82


How reproducible:
Always


Steps to Reproduce:
1. Configure IPA server and add sudo rules
2. Configure SSSD client and enable sudo caching as per the RHEL-6 Identity
   Management guide as found at:
   https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/Identity_Management_Guide/index.html#sudo
3. Use sudo to cache some rules
4. Check the cache with
~~~
ldbsearch -H /var/lib/sss/db/cache_<domain>.ldb \
  -b cn=sudorules,cn=custom,cn=LDAP,cn=sysdb
~~~
5. Invalidate the cached sudo rules with sss_cache


Actual results:
The sss_cache utility does not have options to invalidate the sudo rules.


Expected results:
Same as with for example users and groups, be able to invalidate the cached
sudo rules with sss_cache.


Additional info:
Upstream ticket: https://fedorahosted.org/sssd/ticket/2081