The `RetryJoin` function checks for an error and logs it before
retrying. The error variables were shadowed which resulted in
the errors never being logged. This predefines the variables
to prevent them from being shadowed.
The testlog package was also updated to support providing a custom
writer which allows logging output to be easily caught and inspected.
The agent retry joiner implementation had different parameters
to control its execution for agents running in server and client
mode. The agent would set up individual joiners depending on the
agent mode, making the object parameter overhead unrequired.
This change removes the excess configuration options for the
joiner, reducing code complexity slighly and hopefully making
future modifications in this area easier to make.
The retry_join logic was not allowing for retries to happen and
was exiting after the first failed discovery attempt. This change
fixes that behaviour and adds a test to ensure no further
regressions.
This commit:
* Improves how we combine the old retry-* fields and the new stanza and
how it is validated
* Handles the new stanza setting start_join
* Fixes integration test to not bind to the standard port and instead be
randomized.
* Simplifies parsing of the old retry_interval
* Fixes the errors from retry join being masked
* Flags get parsed into new server_join stanza
