bump macOS test vm to replicate what passes locally

.ci/azure-pipelines.yml

@@ -9,7 +9,7 @@ jobs:
   steps:
   - template: azure-pipelines-steps.yml
   pool:
-    vmImage: macOS-10.13
+    vmImage: macOS-10.14
   strategy:
     matrix:
       Mito27_27:

tests/ansible/integration/action/make_tmp_path.yml

@@ -128,10 +128,6 @@
     # readonly homedir
     #
 
-    - name: DEBUGGING - dump all users and their groups and group ids; become_user fails with sudo gid error
-      shell: dscl . list /Users | grep -v '^_' | xargs -I{} -t -n1 sh -c "id -Gn {} | python -c \"from __future__ import print_function; import sys; import grp; print([grp.getgrnam(line) for line in sys.stdin.read().strip().replace('\n', ' ').split(' ')])\""
-      
-
     - name: "Try writing to temp directory for the readonly_homedir user"
       become: true
       become_user: mitogen__readonly_homedir