Fix kubernetes_version matching (#705)

Co-authored-by: Alex Bulatov <[email protected]>

Author: xbulat

manifests/config/worker.pp

@@ -95,10 +95,10 @@
   $kubelet_extra_config_yaml = regsubst(to_yaml($kubelet_extra_config), '^---\n', '')
 
   $template = $kubernetes_version ? {
-    /1\.12/                  => 'v1alpha3',
-    /1\.1(3|4|5\.[012])/     => 'v1beta1',
-    /1\.(16|17|18|19|20|21)/ => 'v1beta2',
-    default                  => 'v1beta3',
+    /^1\.12/                  => 'v1alpha3',
+    /^1\.1(3|4|5\.[012])/     => 'v1beta1',
+    /^1\.(16|17|18|19|20|21)/ => 'v1beta2',
+    default                   => 'v1beta3',
   }
 
   file { '/etc/kubernetes':