Remove the tortured logic in another_ldap_try() and turn it into

Remove the tortured logic in another_ldap_try() and turn it into
get_cached_ldap_connect(), which much better describes it's function.

Now we always break at the right places in the loop, we can replace
the while (another_ldap_try(ldap_state, &rc, &attempts, abs_endtime))
construct with simply while (1).