Use travis_retry also for the tox command

This is a followup to 07b9147.

Author: blueyed

.travis.yml

@@ -40,9 +40,6 @@ matrix:
     - env: TESTENV=python3.4-master-postgres
     - env: TESTENV=python3.4-master-sqlite
     - env: TESTENV=python3.4-master-sqlite_file
-before_install:
-  # Wrap "pip" with "travis_retry" to retry on network failures.
-  - pip() { travis_retry command pip "$@"; }
 install:
-  - pip install tox
-script: tox -e $TESTENV
+  - travis_retry pip install tox
+script: travis_retry tox -e $TESTENV

generate_configurations.py

@@ -220,12 +220,9 @@ def make_travis_yml(envs):
         matrix:
           allow_failures:
         %(allow_failures)s
-        before_install:
-          # Wrap "pip" with "travis_retry" to retry on network failures.
-          - pip() { travis_retry command pip "$@"; }
         install:
-          - pip install tox
-        script: tox -e $TESTENV
+          - travis_retry pip install tox
+        script: travis_retry tox -e $TESTENV
         """).strip("\n")
     testenvs = '\n'.join('  - TESTENV=%s' % testenv_name(env) for env in envs)
     checkenvs = '\n'.join('  - TESTENV=checkqa-%s' %