This commit works around the lack of a proper timeout in the
ssl.get_server_certificate() call. A proper timeout is available in
python 3.8+ (see https://bugs.python.org/issue31870).
We work around the lack of timeout by first attempting a basic socket
connection to the (host, port) with a short timeout (default: 10s). If
that is successful we can continue to fetch the server certificate;
otherwise we abandon the attempt.
Test Plan / Failure Path:
PASS: Verify proper timeout when subcloud is offline/shutdown
PASS: Verify proper behaviour when subcloud is available
Regression:
PASS: Verify feature logging
Story: 2008960
Task: 43545
Change-Id: If0f7c926e136fc776dbc74ed27b767af1af2cf80
Signed-off-by: Kyle MacLeod <kyle.macleod@windriver.com>
d4f8e43d64