Remove Python 2.7 testing for zulip_bots and zulip_botserver.

.travis.yml

@@ -1,12 +1,13 @@
 language: python
 python:
-  - "2.7"
   - "3.4"
   - "3.5"
   - "3.6"
 env: TEST_SUITE=test-main
 matrix:
   include:
+  - python: "2.7"
+    env: TEST_SUITE=test-py2-legacy-support
   - python: "3.6"
     env: TEST_SUITE=test-static-analysis
 install:

tools/test-py2-legacy-support

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+# This script must be executed in a Python 2 environment to
+# have any meaning.
+
+set -ev
+
+tools/test-zulip --coverage combine