Reduce CI test matrix

Reduce the test cases from 15 to 9, bearing in mind that:
* Disable weave/coreos gate unless its deployment fixed
* If debian/centos7 fails with net plugin X, ubuntu-xenial/rhel-7 will
  likely fail as well
* Canal also covers the flannel plugin deployment, but keep at least one
  of the flannel plugin deployment, unless it's superseded and removed.
* Keep at least one of each OS/plugin family to be tested in the separate
  nodes layout
* Keep at least one of each OS family to be tested against each of the
  plugin types in default nodes layout
* Rebalance GCE regions for instances, replace asia to eu/us as they
  are the longest running jobs.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

.travis.yml

@@ -22,64 +22,42 @@ env:
   matrix:
     # Debian Jessie
     - >-
-      KUBE_NETWORK_PLUGIN=flannel
+      KUBE_NETWORK_PLUGIN=canal
       CLOUD_IMAGE=debian-8
-      CLOUD_REGION=europe-west1-b
+      CLOUD_REGION=europe-west1-d
       CLUSTER_MODE=default
     - >-
       KUBE_NETWORK_PLUGIN=calico
       CLOUD_IMAGE=debian-8
-      CLOUD_REGION=us-central1-c
+      CLOUD_REGION=us-central1-b
       CLUSTER_MODE=default
 
     # Centos 7
     - >-
       KUBE_NETWORK_PLUGIN=flannel
       CLOUD_IMAGE=centos-7
-      CLOUD_REGION=asia-east1-c
+      CLOUD_REGION=europe-west1-d
       CLUSTER_MODE=default
     - >-
       KUBE_NETWORK_PLUGIN=calico
       CLOUD_IMAGE=centos-7
       CLOUD_REGION=europe-west1-b
       CLUSTER_MODE=default
-    - >-
-      KUBE_NETWORK_PLUGIN=weave
-      CLOUD_IMAGE=centos-7
-      CLOUD_REGION=us-central1-c
-      CLUSTER_MODE=default
 
    # Redhat 7
-    - >-
-      KUBE_NETWORK_PLUGIN=calico
-      CLOUD_IMAGE=rhel-7
-      CLOUD_REGION=asia-east1-c
-      CLUSTER_MODE=default
     - >-
       KUBE_NETWORK_PLUGIN=weave
       CLOUD_IMAGE=rhel-7
       CLOUD_REGION=europe-west1-b
       CLUSTER_MODE=default
 
-    # Ubuntu 16.04
-    - >-
-      KUBE_NETWORK_PLUGIN=canal
-      CLOUD_IMAGE=ubuntu-1604-xenial
-      CLOUD_REGION=us-central1-c
-      CLUSTER_MODE=default
-    - >-
-      KUBE_NETWORK_PLUGIN=weave
-      CLOUD_IMAGE=ubuntu-1604-xenial
-      CLOUD_REGION=asia-east1-c
-      CLUSTER_MODE=default
-
     # CoreOS stable
-    - >-
-      KUBE_NETWORK_PLUGIN=weave
-      CLOUD_IMAGE=coreos-stable
-      CLOUD_REGION=europe-west1-b
-      CLUSTER_MODE=default
-      BOOTSTRAP_OS=coreos
+    #- >-
+    #  KUBE_NETWORK_PLUGIN=weave
+    #  CLOUD_IMAGE=coreos-stable
+    #  CLOUD_REGION=europe-west1-a
+    #  CLUSTER_MODE=default
+    #  BOOTSTRAP_OS=coreos
     - >-
       KUBE_NETWORK_PLUGIN=canal
       CLOUD_IMAGE=coreos-stable
@@ -91,28 +69,23 @@ env:
     - >-
       KUBE_NETWORK_PLUGIN=canal
       CLOUD_IMAGE=rhel-7
-      CLOUD_REGION=europe-west1-b
-      CLUSTER_MODE=separate
-    - >-
-      KUBE_NETWORK_PLUGIN=calico
-      CLOUD_IMAGE=ubuntu-1604-xenial
-      CLOUD_REGION=us-central1-a
+      CLOUD_REGION=europe-west1-c
       CLUSTER_MODE=separate
     - >-
       KUBE_NETWORK_PLUGIN=weave
-      CLOUD_IMAGE=debian-8
-      CLOUD_REGION=us-east1-d
+      CLOUD_IMAGE=ubuntu-1604-xenial
+      CLOUD_REGION=us-west1-b
       CLUSTER_MODE=separate
     - >-
       KUBE_NETWORK_PLUGIN=calico
       CLOUD_IMAGE=coreos-stable
-      CLOUD_REGION=asia-east1-c
+      CLOUD_REGION=us-central1-f
       CLUSTER_MODE=separate
       BOOTSTRAP_OS=coreos
 
 matrix:
   allow_failures:
-    - env: KUBE_NETWORK_PLUGIN=weave CLOUD_IMAGE=coreos-stable CLOUD_REGION=europe-west1-b CLUSTER_MODE=default BOOTSTRAP_OS=coreos
+    - env: KUBE_NETWORK_PLUGIN=weave CLOUD_IMAGE=coreos-stable CLOUD_REGION=europe-west1-a CLUSTER_MODE=default BOOTSTRAP_OS=coreos
 
 before_install:
   # Install Ansible.