[MODULES-3562] Implement retry for tests which require modules to pull key from keyserver #631
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This commit implements a function retry_on_error_matching and makes use of that function within tests which are pulling a key from 'hkps.pool.sks-keyservers.net'. These tests were failing occasionally in jenkins when the key server timed out. These changes implement a retry when the error returned is a timeout error.
Whilst making these changes, I found that the tests were incorrectly testing for idempotency so this has been fixed in the first commit.