Switch from testrepository to stestr

Adopts use of newer stestr for running the test suite.

Passing TERM is needed or stestr will ignore the --color option when
run under tox.

Change-Id: Id2d4ce36cdfedd5a847e0428854753d2cf4140ee

.gitignore

@@ -13,3 +13,4 @@ ChangeLog
 *.egg-info
 *.pyc
 doc/build
+.stestr

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./git_review/tests
+top_dir=./

.testr.conf

@@ -1,8 +0,0 @@
-[DEFAULT]
-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 ./ ./git_review/tests $LISTOPT $IDOPTION
-
-test_id_option=--load-list $IDFILE
-test_list_option=--list

test-requirements.txt

@@ -1,5 +1,5 @@
 hacking>=0.10.0,<0.11
 mock
 fixtures>=0.3.14
-testrepository>=0.0.18
+stestr>=2.2.0
 testtools>=0.9.34

tox.ini

@@ -12,12 +12,11 @@ passenv =
   JAVA_HOME
   # uncomment to allow custom java options to be added
   # _JAVA_OPTIONS
-
+  TERM
 commands =
   python -m git_review.tests.check_test_id_hashes discover --list
   python -m git_review.tests.prepare
-  python setup.py testr --slowest --testr-args='--concurrency=2 {posargs}'
-
+  stestr run --color {posargs}
 deps =
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt