Finish simplifying the Seriatim role

tests/converge.yml

@@ -2,6 +2,5 @@
 - name: Converge Seriatim role
   hosts: seriatim
   gather_facts: true
-  become: true
   roles:
     - role: ansible-role-seriatim

tests/integration

@@ -74,14 +74,21 @@ missing_binary_repeat_log="$test_tmp/missing-binary-repeat.log"
 run_converge "$missing_binary_repeat_log"
 require_clean_recap "$missing_binary_repeat_log"
 
-sudo cp -- /bin/false "$binary_path"
-wrong_version_log="$test_tmp/wrong-version.log"
-run_converge "$wrong_version_log"
-require_changed_recap "$wrong_version_log"
-grep -A1 -E 'TASK .*Build Seriatim' "$wrong_version_log" | grep -q '^changed:'
-wrong_version_repeat_log="$test_tmp/wrong-version-repeat.log"
-run_converge "$wrong_version_repeat_log"
-require_clean_recap "$wrong_version_repeat_log"
+custom_go_binary="$test_tmp/go"
+ln -s /snap/bin/go "$custom_go_binary"
+sudo rm -f -- "$binary_path"
+custom_go_log="$test_tmp/custom-go.log"
+run_converge "$custom_go_log" \
+  -e '{"seriatim_manage_build_dependencies": false}' \
+  -e "seriatim_go_binary=$custom_go_binary"
+require_changed_recap "$custom_go_log"
+grep -A1 -E 'TASK .*Build Seriatim' "$custom_go_log" | grep -q '^changed:'
+verify_release v1.5.0 "$default_commit"
+custom_go_repeat_log="$test_tmp/custom-go-repeat.log"
+run_converge "$custom_go_repeat_log" \
+  -e '{"seriatim_manage_build_dependencies": false}' \
+  -e "seriatim_go_binary=$custom_go_binary"
+require_clean_recap "$custom_go_repeat_log"
 
 sudo chmod 0700 "$binary_path"
 metadata_log="$test_tmp/metadata.log"

tests/unsupported.yml

@@ -2,7 +2,6 @@
 - name: Exercise Seriatim platform mutation guard
   hosts: seriatim
   gather_facts: false
-  become: true
   vars:
     ansible_facts:
       distribution: "{{ test_distribution }}"