ci: Ansible 2.8 requires Python 2.7.

Author: dw

.travis.yml

@@ -47,7 +47,7 @@ matrix:
     # 2.4.6.0; 2.7 -> 2.7
     - python: "2.7"
       env: MODE=debops_common VER=2.4.6.0
-    # 2.5.7; 3.6 -> 2.7
+    # 2.8.0; 3.6 -> 2.7
     - python: "3.6"
       env: MODE=debops_common VER=2.8.0
 
@@ -60,7 +60,8 @@ matrix:
     # 2.6 -> {debian, centos6, centos7}
     - python: "2.6"
       env: MODE=ansible VER=2.4.6.0
-    - python: "2.6"
+    # 2.7 -> {debian, centos6, centos7}
+    - python: "2.7"
       env: MODE=ansible VER=2.8.0
 
     # 3.6 -> {debian, centos6, centos7}