[integration-tests] filedescriptor out of range in select() exception in some test cases

[Georgy Dyuldin]

Test result:

https://mirantis.testrail.com/index.php?/tests/view/6049045

Trace:

controller_remote = <mos_tests.environment.ssh.SSHClient object at 0x7f0052202c90> [10.109.2.3:22]
os_conn = <mos_tests.environment.os_actions.OpenStackActions object at 0x7f0052202d90>

    @pytest.mark.testrail_id('842537')
    def test_retrieve_nonroot_certificate(controller_remote, os_conn):
        """Try to retrieve non-root certificate

        Scenario:
            1. Create a default certificate:
                nova x509-create-cert
            2. Make curl query to retrieve root certificate:
                curl -s -H "X-Auth-Token: {token}" \
                {endpoint}/os-certificates/root
            3. Check that certificate data is present in output
            4. Make curl query to retrieve nonroot certificate:
                curl -s -H "X-Auth-Token: {token}" \
                {endpoint}/os-certificates/nonroot
            5. Check that 'Only root certificate can be retrieved' is present
                in output
        """
        os_conn.nova.certs.create()
        token = os_conn.session.get_token()
        endpoint = os_conn.session.get_endpoint(service_type='compute')
        command = (
            'curl -s -H "X-Auth-Token: {token}" '
            '{endpoint}/os-certificates/{{cert_type}}'.format(token=token,
                                                              endpoint=endpoint))
> result = controller_remote.check_call(command.format(cert_type='root'))

mos_tests/nova/negative_test.py:44:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
mos_tests/environment/ssh.py:203: in check_call
    ret = self.execute(command, verbose)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <mos_tests.environment.ssh.SSHClient object at 0x7f0052202c90> [10.109.2.3:22]
command = 'curl -s -H "X-Auth-Token: gAAAAABXPSOGRqdDGAXYjvDcgNzy4p6O71WsgZJ_pCDzSIXGzIBxhiM7KO4XEhZanVcryBNKWI4UgD8sYeWhLq4FgvD...KlOw_Z8NiC3P9GoA_fjqbZy8HCoDa_vpkI_DM" http://10.109.4.4:8774/v2/0ada95a02225483f95e73ae21d8fbdd6/os-certificates/root'
verbose = True, merge_stderr = False

    def execute(self, command, verbose=True, merge_stderr=False):
        chan, stdin, stdout, stderr = self.execute_async(
            command, merge_stderr=merge_stderr)

        stdout_buf = ''
        stderr_buf = ''

        while not chan.closed or chan.recv_ready() or chan.recv_stderr_ready():
> select.select([chan], [], [chan], 60)
E ValueError: filedescriptor out of range in select()

Possible reason:

SSH open connections leak

[Georgy Dyuldin (g-dyuldin)]

Commit that fix it:

https://review.gerrithub.io/#/c/277195/