fix config del/add mods - memberof is transaction aware
    
    Bug 741744 - part3 - MOD operations with chained delete/add get back error 53
    1d2f5a0 make memberof transaction aware and able to be a betxnpostoperation plug in
    b6d3ba7 pass the plugin config entry to the plugin init function
    28f7bfb set the ENTRY_POST_OP for modrdn betxnpostoperation plugins
    Bug 743966 - Compiler warnings in account usability plugin
    (cherry picked from commit 6ca11f472189b64d746ed0f81e3d387ecce3eb05)
    (cherry picked from commit 2f39983f7039cf681fc7c6323b2f30676d81ac0a)