Remove Puppet 5 testing

provision.yaml

@@ -14,12 +14,6 @@ travis_deb:
   - litmusimage/debian:8
   - litmusimage/debian:9
   - litmusimage/debian:10
-travis_ub_5:
-  provisioner: docker
-  images:
-  - litmusimage/ubuntu:14.04
-  - litmusimage/ubuntu:16.04
-  - litmusimage/ubuntu:18.04
 travis_ub_6:
   provisioner: docker
   images:
@@ -37,27 +31,6 @@ travis_el8:
   provisioner: docker
   images:
   - litmusimage/centos:8
-release_checks_5:
-  provisioner: abs
-  images:
-  - redhat-6-x86_64
-  - redhat-7-x86_64
-  - redhat-8-x86_64
-  - centos-6-x86_64
-  - centos-7-x86_64
-  - centos-8-x86_64
-  - oracle-6-x86_64
-  - oracle-7-x86_64
-  - scientific-6-x86_64
-  - scientific-7-x86_64
-  - debian-8-x86_64
-  - debian-9-x86_64
-  - debian-10-x86_64
-  - ubuntu-1404-x86_64
-  - ubuntu-1604-x86_64
-  - ubuntu-1804-x86_64
-  - sles-12-x86_64
-  - sles-15-x86_64
 release_checks_6:
   provisioner: abs
   images: