Code duplication in check_latest_version

[Phill]

check_latest_version in core.utils.__init__.py duplicates code to download and retry on failure of the version check file. This code is similar to the code in get_webpage. We could reduce duplication by using get_webpage

Duplicate code:

        retries = 0
        while True:
            try:
                remote_version = str(urllib.request.urlopen(req, None,
                                                            timeout=CONNECTION_TIMEOUT).read().decode()).strip()
            except ConnectionException:
                if retries > CONNECTION_RETRIES:
                    log.exception('Failed to download the latest OpenLP version file')
                else:
                    retries += 1
                    time.sleep(0.1)
                    continue
            break

[Ken Roberts (alisonken1)]

Working on network stack refactoring. Will be fixed then.

[Phill (phill-ridout)]

Changed to wishlist as this isnt really a bug