updated link for CentOS ISO download
updated link for CentOS ISO download

The links for the previous ISO is no longer working. Changed to a link using the MIT mirror which will hopefully prove to be more stable long-term

Signed-off-by: Kendrick Coleman <1ceaec95b8b1429c2b14446d8c577659e7edb4d9@gmail.com>

RackHD/RackHD,patelb10/RackHD,jlongever/RackHD,srinia6/RackHD,johren/RackHD,patelb10/RackHD,rolandpoulter/RackHD,changev/RackHD,panpan0000/RackHD,DavidjohnBlodgett/RackHD,stuart-stanley/RackHD,tldavies/RackHD,RackHD-Mirror/RackHD,stuart-stanley/RackHD,johren/RackHD,uppalk1/RackHD,DavidjohnBlodgett/RackHD,panpan0000/RackHD,changev/RackHD,uppalk1/RackHD,DavidjohnBlodgett/RackHD,jlongever/RackHD,tldavies/RackHD,srinia6/RackHD,geoff-reid/RackHD,tannoa2/RackHD,changev/RackHD,tldavies/RackHD,johren/RackHD,jlongever/RackHD,DavidjohnBlodgett/RackHD,uppalk1/RackHD,panpan0000/RackHD,RackHD-Mirror/RackHD,RackHD/RackHD,uppalk1/RackHD,tannoa2/RackHD,jlongever/RackHD,tannoa2/RackHD,stuart-stanley/RackHD,BillyAbildgaard/RackHD,BillyAbildgaard/RackHD,stuart-stanley/RackHD,tannoa2/RackHD,srinia6/RackHD,RackHD-Mirror/RackHD,geoff-reid/RackHD,BillyAbildgaard/RackHD,patelb10/RackHD,geoff-reid/RackHD,rolandpoulter/RackHD,hohene/RackHD,RackHD/RackHD,hohene/RackHD,BillyAbildgaard/RackHD,rolandpoulter/RackHD,tldavies/RackHD,srinia6/RackHD,hohene/RackHD,geoff-reid/RackHD,changev/RackHD,patelb10/RackHD,RackHD-Mirror/RackHD,johren/RackHD,panpan0000/RackHD,hohene/RackHD,rolandpoulter/RackHD,RackHD/RackHD