IPA named-dyndb-ldap may lose LDAP connection when LDAP server is under high load

Issue

• The service IPA / IdM services using named-dyndb-ldap may loose LDAP connection when the remote LDAP server is under temporary spike or high load.
  For example, a bulk add of users and groups using an IPA command such as

ipa group-add-member --users="$someusers" $somegroup"

Can generate a spike CPU and disk I/O load on all LDAP servers used in IPA replication.
Depending on the scenario and environment, the load can be high enough to slow down the LDAP service excessively, which can result in other outages such as the DNS service.