Flaky test: test/e2e-go/features/participation TestPartkeyOnlyRewards

[algobarb]

Description

Travis Test Errors Reference Spreadsheet for details on cases where this test has failed: https://docs.google.com/spreadsheets/d/1apjaNvZodnTSIdZaQlpMaqf0nzbKgSYdIWHqvmINHS8/edit#gid=0

Example Failure

Time: Wed 7/21/2021 Build: https://app.travis-ci.com/github/algorand/go-algorand/jobs/525817892#L4550 Travis Test: Ubuntu AMD64 Integration Test Package: test/e2e-go/features/participation Test: TestPartkeyOnlyRewards

algod(11830) : created by github.com/[secure]/go-[secure]/network.(*WebsocketNetwork).Start
    fixture.go:105: 
        	Error Trace:	participationRewards_test.go:159
        	Error:      	Received unexpected error:
        	            	fixture.WaitForRound took 535.19 seconds between round 33 and 34
        	Test:       	TestPartkeyOnlyRewards

Acceptance criteria:

• Reproduce & resolve the failure