Merge pull request #13826 from dotnet/dev/marcpop/removedocker3.1.4xx

Remove the 8 dockerfiles flagged by compliance

Author: marcpopMSFT

netci.groovy

@@ -93,11 +93,11 @@ ${buildCommand}
         }
     }
     else if (os == 'Ubuntu') {
-        buildCommand = "${baseShellBuildCommand} --docker ubuntu.14.04"
+        buildCommand = "${baseShellBuildCommand} --docker ubuntu.18.04"
     }
     else if (os == 'RHEL6') {
         osUsedForMachineAffinity = 'Ubuntu16.04';
-        buildCommand = "${baseShellBuildCommand} --runtime-id rhel.6-x64 --docker rhel.6"
+        buildCommand = "${baseShellBuildCommand} --runtime-id rhel.6-x64 --docker rhel"
     }
     else if (os == 'ubuntu.18.04' || os == 'fedora.27' || os == 'opensuse.42.3') {
         osUsedForMachineAffinity = 'Ubuntu16.04'

scripts/docker/fedora.23/Dockerfile

@@ -75,16 +75,8 @@ if [ -z "$DOCKERFILE" ]; then
             export DOCKERFILE=scripts/docker/debian
         elif [ "$(cat /etc/*-release | grep -cim1 fedora)" -eq 1 ]; then
             echo "Detected current OS as Fedora, determining fedora version to use..."
-            if [ "$(cat /etc/*-release | grep -cim1 23)" -eq 1 ]; then
-                echo "using 'fedora.23' image"
-                export DOCKERFILE=scripts/docker/fedora.23
-            fi
         elif [ "$(cat /etc/*-release | grep -cim1 opensuse)" -eq 1 ]; then
             echo "Detected current OS as openSUSE, determining openSUSE version to use..."
-            if [ "$(cat /etc/*-release | grep -cim1 13.2)" -eq 1 ]; then
-                echo "using 'openSUSE.13.2' image"
-                export DOCKERFILE=scripts/docker/opensuse.13.2
-            fi
         else
             echo "Unknown Linux Distro. Using 'ubuntu' image"
             export DOCKERFILE=scripts/docker/ubuntu