Added some extension checking for upgrade.php
Added some extension checking for upgrade.php

snipe/snipe-it,snipe/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,snipe/snipe-it,snipe/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,mtucker6784/snipe-it,uberbrady/snipe-it,uberbrady/snipe-it,mtucker6784/snipe-it