ipa-kdb: reinitialize LDAP configuration for known realms
    
    ipa-kdb did not reinitialize trusted domain configuration when it
    was loaded to ipa-kdb. However, admin then would have to restart
    krb5kdc if he wanted to apply the change to running krb5kdc service.
    
    Run ipadb_reinit_mspac unconditionally every time when trusted domain
    is loaded. Among the already configured 1 minute grace time, also
    add a quick check if there is at least one configured trusted domain
    before reinitializing the mspac structure.
    
    https://fedorahosted.org/freeipa/ticket/3289