[CentOS-mirror] hostname change from repo.cloudhosting.com.hk to repo.virtualhosting.hk

[Ronald at UDomain]

Hi,

Due to heavy DNS attack to old domain, we have switch the hostname and
following are new URL of mirror.

http://repo.virtualhosting.hk/centos/
ftp://repo.virtualhosting.hk/centos/

BW: 1Gbps
Location: Hong Kong
Sync schedule: every 6 hours