Merge remote-tracking branch 'origin/travis-reorder'

* origin/travis-reorder:
  ci: try moving slower 2.8.0 jobs together
  ci: roughly bin-pack Travis jobs longest->shortest

Author: dw

.travis.yml

@@ -35,6 +35,38 @@ matrix:
       env: MODE=mitogen_py24 DISTRO=centos5
 
   include:
+    # Debops tests.
+    # 2.8.0; 3.6 -> 2.7
+    - python: "3.6"
+      env: MODE=debops_common VER=2.8.0
+    # 2.4.6.0; 2.7 -> 2.7
+    - python: "2.7"
+      env: MODE=debops_common VER=2.4.6.0
+
+    # Sanity check against vanilla Ansible. One job suffices.
+    - python: "2.7"
+      env: MODE=ansible VER=2.8.0 DISTROS=debian STRATEGY=linear
+
+    # ansible_mitogen tests.
+
+    # 2.8.0 -> {debian, centos6, centos7}
+    - python: "3.6"
+      env: MODE=ansible VER=2.8.0
+    # 2.8.0 -> {debian, centos6, centos7}
+    - python: "2.7"
+      env: MODE=ansible VER=2.8.0
+
+    # 2.4.6.0 -> {debian, centos6, centos7}
+    - python: "3.6"
+      env: MODE=ansible VER=2.4.6.0
+    # 2.4.6.0 -> {debian, centos6, centos7}
+    - python: "2.6"
+      env: MODE=ansible VER=2.4.6.0
+
+    # 2.3 -> {centos5}
+    - python: "2.6"
+      env: MODE=ansible VER=2.3.3.0 DISTROS=centos5
+
     # Mitogen tests.
     # 2.4 -> 2.4
     - language: c
@@ -50,34 +82,3 @@ matrix:
     - python: "2.6"
       env: MODE=mitogen DISTRO=debian-py3
     # 3.6 -> 2.6 -- moved to Azure
-
-    # Debops tests.
-    # 2.4.6.0; 2.7 -> 2.7
-    - python: "2.7"
-      env: MODE=debops_common VER=2.4.6.0
-    # 2.8.0; 3.6 -> 2.7
-    - python: "3.6"
-      env: MODE=debops_common VER=2.8.0
-
-    # ansible_mitogen tests.
-
-    # 2.3 -> {centos5}
-    - python: "2.6"
-      env: MODE=ansible VER=2.3.3.0 DISTROS=centos5
-
-    # 2.6 -> {debian, centos6, centos7}
-    - python: "2.6"
-      env: MODE=ansible VER=2.4.6.0
-    # 2.7 -> {debian, centos6, centos7}
-    - python: "2.7"
-      env: MODE=ansible VER=2.8.0
-
-    # 3.6 -> {debian, centos6, centos7}
-    - python: "3.6"
-      env: MODE=ansible VER=2.4.6.0
-    - python: "3.6"
-      env: MODE=ansible VER=2.8.0
-
-    # Sanity check against vanilla Ansible. One job suffices.
-    - python: "2.7"
-      env: MODE=ansible VER=2.8.0 DISTROS=debian STRATEGY=linear