Make the secondary check-in timeout for salt commands configurable

[basepi]

We can currently configure the initial timeout for salt commands (before the master starts checking with minions) using the -t flag. We should also make the secondary timeout (hardcoded to 2 currently?) configurable, both with a command line arg and a configuration option in the master config.

This will help a lot with long jobs in low-latency conditions. (like #6881)

[solugebefola]

Hi there,
I am newly arrived from CodeTriage. Can you tell me the specific file that contains the code for the timeouts for salt commands? Thanks

[basepi]

All of the command line parsing into salt config values happens in https://github.com/saltstack/salt/blob/develop/salt/utils/parsers.py

[stale]

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