Rework CI triggers/pipeline

* Run CI triggers in one step
* Run all test matrix for triggers
* Switch back to g1-small

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

tests/cloud_playbooks/create-gce.yml

@@ -3,7 +3,7 @@
   become: false
   gather_facts: no
   vars:
-    cloud_machine_type: n1-standard-1
+    cloud_machine_type: g1-small
     mode: default
 
   tasks:

tests/cloud_playbooks/delete-gce.yml

@@ -3,7 +3,6 @@
   become: false
   gather_facts: no
   vars:
-    cloud_machine_type: f1-micro
     mode: default
 
   tasks:
@@ -22,8 +21,6 @@
     - name: delete gce instances
       gce:
         instance_names: "{{instance_names}}"
-        machine_type: "{{ cloud_machine_type }}"
-        preemptible: yes
         image: "{{ cloud_image }}"
         service_account_email: "{{ gce_service_account_email }}"
         pem_file: "{{ gce_pem_file | default(omit)}}"