Finalize renaming MAX_WAITSOCK --> ROBOT_TIMEOUT (3.2)

[drwetter]

The commit 6753a95c939359f9e06fb9f3dd199a0 changed some variables however for consistency MAX_WAITSOCK should have been completely changed to ROBOT_TIMEOUT .

This PR suggests that. Moreover it changes the local variable robottimeout to robot_timeout.

This fixes #2983 for 3.2 .

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