Revert "Break out testing into its own triple-parallelized flow"

This reverts commit 9e5e2a23d4.

.gitlab-ci.yml

@@ -39,7 +39,6 @@ after_script:
     [ -n "$ZEROTIER_NETWORK_ID" ] && \
     zerotier-cli leave "$ZEROTIER_NETWORK_ID"
 
-## HOUSEKEEPING
 Lint:
   stage: lint
   allow_failure: yes
@@ -51,45 +50,31 @@ Lint:
     - ansible-lint --version
     - ansible-lint site.yml
 
-## TEST
-.test:
+Test:
   stage: test
   interruptible: yes
   except:
     - pipelines
-  allow_failure:
-    exit_codes:
-      - 4
+  script:
+    - ansible-playbook --skip-tags no-test -C site.yml --vault-password-file /vaultpw || error="$?"
+    - if [ "$error" -eq 4 ]; then echo "Some hosts were unreachable; masking error"; unset error; fi
+    - if [ -n "$error" ]; then echo "Return code $error"; false; fi
 
-pis:test:
-  extends: .test
-  script:
-    - ansible-playbook -l tags_pis --skip-tags no-test -C site.yml --vault-password-file /vaultpw
-desktop:test:
-  extends: .test
-  script:
-    - ansible-playbook -l tags_desktop --skip-tags no-test -C site.yml --vault-password-file /vaultpw
-prod:test:
-  extends: .test
-  script:
-    - ansible-playbook -l tags_prod --skip-tags no-test -C site.yml --vault-password-file /vaultpw
-
-## PLAY
-.play:
+Play_Against_Pis:
   stage: play
-  allow_failure:
-    exit_codes:
-      - 4
-
-pis:play:
-  extends: .play
   script:
-    - ansible-playbook -l tags_pis site.yml --vault-password-file /vaultpw
-desktop:play:
-  extends: .play
+    - ansible-playbook -l tags_pis site.yml --vault-password-file /vaultpw || error="$?"
+    - if [ "$error" -eq 4 ]; then echo "Some hosts were unreachable; masking error"; unset error; fi
+    - if [ -n "$error" ]; then echo "Return code $error"; false; fi
+Play_Against_Desktops:
+  stage: play
   script:
-    - ansible-playbook -l tags_desktop site.yml --vault-password-file /vaultpw
-prod:play:
-  extends: .play
+    - ansible-playbook -l tags_desktop site.yml --vault-password-file /vaultpw || error="$?"
+    - if [ "$error" -eq 4 ]; then echo "Some hosts were unreachable; masking error"; unset error; fi
+    - if [ -n "$error" ]; then echo "Return code $error"; false; fi
+Play_Against_Production:
+  stage: play
   script:
-    - ansible-playbook -l tags_prod site.yml --vault-password-file /vaultpw
+    - ansible-playbook -l tags_prod site.yml --vault-password-file /vaultpw || error="$?"
+    - if [ "$error" -eq 4 ]; then echo "Some hosts were unreachable; masking error"; unset error; fi
+    - if [ -n "$error" ]; then echo "Return code $error"; false; fi