Delete temporary file

[vhernando]

If tempdir is not set in Queue initialization, a temporary file is created to test if default tempdir is in the same filesystem as queue path.

This patch deletes this temporary file to avoid accumulation of junk temporary files after several executions.

[peter-wangxu]

@vhernando the tests failed due to the removal

[vhernando]

I have no windows machine to test, but probably this will solve it.

[vhernando]

In my machine the test that fails does succeed:

$ tox -e cover
...
cover installed: appdirs==1.4.4,cov-core==1.15.0,coverage==5.5,distlib==0.3.1,dnspython==1.16.0,eventlet==0.31.0,filelock==3.0.12,flake8==3.9.2,greenlet==1.1.0,mccabe==0.6.1,mock==4.0.3,msgpack==1.0.2,nose2==0.10.0,-e git+https://github.com/vhernando/persist-queue@d638b6d4cd9bda554b4d97beba1cb124cf097513#egg=persist_queue,pycodestyle==2.7.0,pyflakes==2.3.1,six==1.16.0,virtualenv==20.4.6
cover run-test-pre: PYTHONHASHSEED='308606054'
cover run-test: commands[0] | nose2 --with-coverage --coverage-report xml --coverage-report html --coverage-report term
....WARNING:persistqueue.sqlackqueue:Can't find item in unack cache.
WARNING:persistqueue.sqlackqueue:Can't find item in unack cache.
WARNING:persistqueue.sqlackqueue:Can't find item in unack cache.
.................WARNING:persistqueue.sqlackqueue:resume 1 unack tasks
WARNING:persistqueue.sqlackqueue:resume 1 unack tasks
.....WARNING:persistqueue.sqlackqueue:Can't find item in unack cache.
WARNING:persistqueue.sqlackqueue:Can't find item in unack cache.
WARNING:persistqueue.sqlackqueue:Can't find item in unack cache.
.....sss.ss.s....ss........sssss.s....s.......s...............................................................................................................

Ran 184 tests in 2634.166s

OK (skipped=16)
Name Stmts Miss Branch BrPart Cover

persistqueue/init.py 14 4 0 0 71%
persistqueue/common.py 9 1 2 1 82%
persistqueue/exceptions.py 8 2 0 0 75%
persistqueue/pdict.py 50 1 2 0 98%
persistqueue/queue.py 217 28 86 10 83%
persistqueue/serializers/init.py 0 0 0 0 100%
persistqueue/serializers/json.py 12 0 0 0 100%
persistqueue/serializers/msgpack.py 20 2 8 2 79%
persistqueue/serializers/pickle.py 17 1 8 1 84%
persistqueue/sqlackqueue.py 243 16 76 18 89%
persistqueue/sqlbase.py 136 7 22 3 92%
persistqueue/sqlqueue.py 134 6 42 7 93%
persistqueue/tests/init.py 0 0 0 0 100%
persistqueue/tests/test_pdict.py 65 1 10 1 97%
persistqueue/tests/test_queue.py 232 0 40 0 100%
persistqueue/tests/test_sqlackqueue.py 317 0 44 0 100%
persistqueue/tests/test_sqlqueue.py 299 0 52 0 100%

TOTAL 1773 69 392 43 94%

__________________________________________ summary ___________________________________________
cover: commands succeeded
congratulations :)

[peter-wangxu]

LGTM