Ian Wienand 6b9907dcd8 Add centos/ to centos mirror path
As a follow-on to I0e110ef51c8ed301fd8280ae7fc039e3b01db92c; this
dropped the /centos/ from the base mirror, add it back.

Also switch the mirror to the only one on the altarch-mirrors page
that is in US/TX, which from the name is in Dallas, which must be
pretty close to rax.dfw where the update server lives.

Change-Id: If4d71865f4328e73a26c7b38300767ed6b790579
2019-06-06 13:36:36 +10:00
..