Python 3.9 shuffled the exception hierarchy, have to look for IOError, OSError one of which is common parent of both hierarchies

The change should've been API compatible, so that's not the reason for failing PR

https://docs.python.org/3.9/library/socket.html#socket.error

Author: jiridanek

.travis.yml

@@ -98,6 +98,7 @@ jobs:
     before_install:
       - sudo apt-get install clang-11 llvm-11-dev
       # Python 3.8.2 in Ubuntu LTS has ASan issues
+      - sudo apt install -y python3-pip
       - sudo add-apt-repository -y ppa:deadsnakes/ppa
       - sudo apt-get update
       - sudo apt-get install python3.9 python3.9-dev python3.9-distutils
@@ -114,10 +115,7 @@ jobs:
       # DISPATCH-1883: Install selectors to run tcp echo server/client tools
       - python3 -m pip install --user selectors
       # Install grpcio and protobuf to run the grpc tests.
-      #  Installation on AArch64 currently broken https://github.com/grpc/grpc/pull/25363
-      #  Binary wheel is not available in PyPI for Aarch64 and source install requires fetching git submodules first
-      - python3 -m pip install --user protobuf
-      - sudo apt install python3-grpcio
+      - python3 -m pip install --user protobuf grpcio
     env:
       - QPID_SYSTEM_TEST_TIMEOUT=300
       - CC=clang-11