Workaround pypy bug on trusty when running tests

https://bitbucket.org/pypy/pypy/issue/1694/ affects zaqar when running
pypy tests on trusty slave nodes. We can work around that bug by setting
--jit off when running the pypy interpreter. Do this until the upstream
bug fix is backported into trusty.

Change-Id: Iebaa167e9e12bbc1017371929ca8c182bacc2aad
Related-Bug: 1368418

.testr.conf

@@ -2,7 +2,7 @@
 test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
              OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
              OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-60} \
-             ${PYTHON:-python} -m subunit.run discover -t . ./tests $LISTOPT $IDOPTION
+             ${PYTHON:-python} $JIT_FLAG -m subunit.run discover -t . ./tests $LISTOPT $IDOPTION
 
 test_id_option=--load-list $IDFILE
 test_list_option=--list

tox.ini

@@ -27,6 +27,12 @@ deps = -r{toxinidir}/requirements-py3.txt
 deps = -r{toxinidir}/requirements-py3.txt
        -r{toxinidir}/test-requirements-py3.txt
 
+[testenv:pypy]
+setenv = VIRTUAL_ENV={envdir}
+         ZAQAR_TESTS_DIR={toxinidir}/tests
+         ZAQAR_TESTS_CONFIGS_DIR={toxinidir}/tests/etc/
+         JIT_FLAG=--jit off
+
 [tox:jenkins]
 downloadcache = ~/cache/pip