add catalina, drop sierra test support

azure-pipelines.yml

@@ -47,10 +47,9 @@ jobs:
 - template: test-kitchen.yml@templates
   parameters:
     platforms:
-    - high-sierra-chef14
-    - mojave-chef14
     - high-sierra-chef15
     - mojave-chef15
+    - catalina-chef15
     suites:
     - default
     - software-updates
@@ -64,4 +63,4 @@ jobs:
     - delete-users
     - keychain
     - remote-access
-    kitchenFile: kitchen.yml
+    kitchenFile: kitchen.yml

kitchen.yml

@@ -17,34 +17,6 @@ verifier:
   - test/integration/default
 
 platforms:
-- name: sierra-chef14
-  driver:
-    box: microsoft/macos-sierra
-    box_version: 10.12.6
-  provisioner:
-    product_version: 14
-
-- name: high-sierra-chef14
-  driver:
-    box: microsoft/macos-high-sierra
-    box_version: 10.13.6
-  provisioner:
-    product_version: 14
-
-- name: mojave-chef14
-  driver:
-    box: microsoft/macos-mojave
-    box_version: 10.14.6
-  provisioner:
-    product_version: 14
-
-- name: sierra-chef15
-  driver:
-    box: microsoft/macos-sierra
-    box_version: 10.12.6
-  provisioner:
-    product_version: 15
-
 - name: high-sierra-chef15
   driver:
     box: microsoft/macos-high-sierra
@@ -59,6 +31,13 @@ platforms:
   provisioner:
     product_version: 15
 
+- name: catalina-chef15
+  driver:
+    box: microsoft/macos-catalina
+    box_version: 10.15.0-19A573a
+  provisioner:
+    product_version: 15
+
 suites:
 - name: default
   provisioner: