Remove packer jobs for deprecated nodes
Issue-ID: CIMAN-33
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: Id07fdbf542d43dd121b8bfa6789b818ef6221a10
     build-timeout: 90
 
     platforms:
-      - centos-7
       - centos-cs-8
       - ubuntu-18.04
       - ubuntu-20.04
     platforms:
       - centos-7
       - centos-cs-8
-      - ubuntu-18.04-arm64
       - ubuntu-18.04
       - ubuntu-20.04
-      - ubuntu-20.04-arm64
     templates: docker
     update-cloud-image: true
 
     build-timeout: 90
 
     platforms:
-      - ubuntu-18.04
       - ubuntu-20.04
     templates: memcached
     update-cloud-image: true
     build-node: centos8-builder-2c-1g
 
     platforms:
-      - centos-7
       - centos-cs-8
     templates: redis
     update-cloud-image: true
     build-node: centos8-builder-2c-1g
 
     platforms:
-      - ubuntu-18.04
       - ubuntu-20.04
     templates: helm
     update-cloud-image: true