Bug 735121 - simple paged search + ip/dns based ACI hangs server
    
    https://bugzilla.redhat.com/show_bug.cgi?id=735121
    Resolves: bug 735121
    Bug Description: simple paged search + ip/dns based ACI hangs server
    Reviewed by: nhosoi (Thanks!)
    Branch: 389-ds-base-1.2.9
    Fix Description: The pb_conn->c_mutex lock around be->be_next_search_entry()
    was too big.  Other code inside be->be_next_search_entry needs to lock
    the conn.  In this particular case, the aci code needed to access the
    client ip address from the conn object.  The fix is to remove the mutex
    around be->be_next_search_entry() in iterate() and instead make sure
    code that accesses pb_conn locks first.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no
    (cherry picked from commit b5f77c693d50ca3acf58eb7a41d9eded59328632)