Fix yum repos for kitchen tests

centos8 mirrors have moved, adjust kitchen setup accordingly.

Also use latest Chef 17 since internally Meta is on at least
that version.

Signed-off-by: Phil Dibowitz <phil@ipom.com>

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
         os: ${{ matrix.os }}
       env:
         CHEF_LICENSE: accept-no-persist
-        CHEF_VERSION: 16.18.0
+        CHEF_VERSION: 18.6.4
   shellcheck:
     runs-on: ubuntu-latest
     steps:

.kitchen.yml

@@ -22,6 +22,9 @@ platforms:
       intermediate_instructions:
         # stub out /etc/fstab for fb_fstab
         - RUN touch /etc/fstab
+        # mirrorlist.centos.org doesn't exist anymore, use baseurl
+        - RUN sed -i=.bak -e 's/^mirrorlist/#mirrorlist/g' -e 's!^#baseurl=http://mirror.centos.org/$contentdir/$stream!baseurl=https://vault.centos.org/$stream!g' /etc/yum.repos.d/*.repo
+        - RUN rm /etc/yum.repos.d/*.bak
         # enable EPEL (for stuff like hddtemp)
         - RUN rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
   - name: ubuntu-18.04