Fix Pyro work with SSL wrapper (sslpsk)

Following error was shown in Beremiz console:
PYRO connecting to URI : PYROS://127.0.0.1:3001#beremiz
Exception while connecting to 'PYROS://127.0.0.1:3001#beremiz': non-zero flags not allowed in calls to recv() on <class 'ssl.SSLSocket'>
Connection failed to PYROS://127.0.0.1:3001#beremiz!

Reason is that Pyro calls socket recv() with MSGWAITALL flag, that causes ValueError exception.

https://docs.python.org/2/library/ssl.html
recv(), recv_into() (but passing a non-zero flags argument is not allowed)

image: skvorl/beremiz-requirements

pipelines:
  default:
    - parallel:
        - step:
            name: Codestyle checks
            script:
              - ln -s /CanFestival-3 $BITBUCKET_CLONE_DIR/../CanFestival-3
              - /usr/bin/python --version
              - ./tests/tools/check_source.sh
        - step:
            name: Application tests
            max-time: 10
            script:
              - ln -s /CanFestival-3 $BITBUCKET_CLONE_DIR/../CanFestival-3
              - ./tests/tools/run_python_tests.sh