Revert "Temporarily disable failing opensuse test jobs."

This reverts commit 31d2eb0828.

(cherry picked from commit 67c7bd8745)

shippable.yml

@@ -31,6 +31,8 @@ matrix:
     - env: TEST=linux/centos7/1
     - env: TEST=linux/fedora24/1
     - env: TEST=linux/fedora25/1
+    - env: TEST=linux/opensuse42.2/1
+    - env: TEST=linux/opensuse42.3/1
     - env: TEST=linux/ubuntu1404/1
     - env: TEST=linux/ubuntu1604/1
     - env: TEST=linux/ubuntu1604py3/1
@@ -39,6 +41,8 @@ matrix:
     - env: TEST=linux/centos7/2
     - env: TEST=linux/fedora24/2
     - env: TEST=linux/fedora25/2
+    - env: TEST=linux/opensuse42.2/2
+    - env: TEST=linux/opensuse42.3/2
     - env: TEST=linux/ubuntu1404/2
     - env: TEST=linux/ubuntu1604/2
     - env: TEST=linux/ubuntu1604py3/2