Fix issue when adding a new TRES to AccountingStorageTRES for the first

time.

https://bugs.schedmd.com/show_bug.cgi?id=2547

The code just wasn't fully baked before and was probably written before
a lot of the other supporting code was done i.e
assoc_mgr_set_assoc|qos_tres_cnt were done specifically for this kind of
thing.  Many of the usage structures weren't realloced either as well as
the tres_cnt local to each qos and assoc wasn't updated.  So all in all
pretty bad code - bad Danny.  This makes sure all this sets up and no
memory corruption happens.