Remove call to api.Backend.ldap2.disconnect()

This was added while I was testing the IPA LDAP client
cache performance. By disconnecting a summary of the cache is
logged. I never intended it remain in the code.

Fixes: #310

Signed-off-by: Rob Crittenden <rcritten@redhat.com>

src/ipahealthcheck/core/core.py

@@ -10,7 +10,6 @@
 import sys
 import traceback
 import warnings
-from ipalib import api
 
 from datetime import datetime, timezone
 
@@ -465,7 +464,6 @@ def run_healthcheck(self):
             return 1
 
         results = exclude_keys(config, results)
-        api.Backend.ldap2.disconnect()
 
         try:
             output.render(results)