Drop Kubernetes 1.17 support

CSIDriver storage API in Kubernetes 1.17 is in beta which is deprecated and
shall be removed in upcoming 1.22. To migrated cleanly to v1 API we drop
1.17 support.

Jenkinsfile

@@ -212,32 +212,6 @@ pipeline {
                         TestInVM("fedora-1.18", "fedora", "", "1.18", "")
                     }
                 }
-                stage('1.17') {
-                    options {
-                        timeout(time: 540, unit: "MINUTES")
-                    }
-                    agent {
-                        label "pmem-csi"
-                    }
-                    steps {
-                        TestInVM("fedora-1.17", "fedora", "", "1.17", "Top.Level..[[:alpha:]]*-testing[[:space:]]")
-                    }
-                }
-
-                // Disabled because of stability issues:
-                // - https://github.com/clearlinux/distribution/issues/2007
-                // - https://github.com/clearlinux/distribution/issues/1980
-                // stage('Clear Linux, 1.17') {
-                //     options {
-                //         timeout(time: 240, unit: "MINUTES")
-                //     }
-                //     agent {
-                //         label "pmem-csi"
-                //     }
-                //     steps {
-                //         TestInVM("clear-1.17", "clear", "${env.CLEAR_LINUX_VERSION_1_17}", "",  "Top.Level..[[:alpha:]]*-testing[[:space:]]")
-                //     }
-                // }
             }
         }
 

Makefile

@@ -167,7 +167,6 @@ KUSTOMIZE_KUBERNETES_OUTPUT = \
     deploy/kubernetes-X.XX/pmem-csi-lvm-testing.yaml=deploy/kustomize/kubernetes-base-lvm-coverage \
 
 KUSTOMIZE_KUBERNETES_VERSIONS = \
-    1.17 \
     1.18 \
     1.19 \
     1.20 \

README.md

@@ -33,7 +33,7 @@ versions:
 | 1.14               |                                | unsupported <sup>2</sup>
 | 1.15               | CSIInlineVolume                | unsupported <sup>3</sup>
 | 1.16               |                                | unsupported <sup>4</sup>
-| 1.17               |                                | supported
+| 1.17               |                                | unsupported <sup>5</sup>
 | 1.18               |                                | supported
 | 1.19               |                                | supported
 | 1.20               |                                | supported
@@ -57,6 +57,8 @@ Not supported officially by upstream anymore.
 2.0.0 because support for the v1beta CSI APIs was removed. Also not
 supported officially by upstream anymore.
 
+<sup>5</sup> Kubernetes 1.17 uses deprecated beta storage APIs.
+
 ## Feature status
 
 PMEM-CSI is under active development. New features are added