[CI] Gocbcore DCP test intermittent fail against 7.0

The DCP tests intermittently fail against 7.0, always the same way:

 
http://sdk.jenkins.couchbase.com/blue/organizations/jenkins/golang%2Fgocbcore%2Fgocbcore-scripted-build-pipeline/detail/gocbcore-scripted-build-pipeline/2452/pipeline#step-775-log-735 — FAIL: TestDCPSuite/TestMutationsCollection (22.56s)
http://sdk.jenkins.couchbase.com/blue/organizations/jenkins/golang%2Fgocbcore%2Fgocbcore-scripted-build-pipeline/detail/gocbcore-scripted-build-pipeline/2452/pipeline#step-775-log-736 testdcpsuite_test.go:301: Failed to perform mutations due to context deadline exceeded
http://sdk.jenkins.couchbase.com/blue/organizations/jenkins/golang%2Fgocbcore%2Fgocbcore-scripted-build-pipeline/detail/gocbcore-scripted-build-pipeline/2452/pipeline#step-775-log-737 — FAIL: TestDCPSuite/TestScopesBasic (8.08s)
testdcpsuite_test.go:512:
 
http://sdk.jenkins.couchbase.com/blue/organizations/jenkins/golang%2Fgocbcore%2Fgocbcore-scripted-build-pipeline/detail/gocbcore-scripted-build-pipeline/2452/pipeline#step-775-log-742 Error Trace: testdcpsuite_test.go:512
 
http://sdk.jenkins.couchbase.com/blue/organizations/jenkins/golang%2Fgocbcore%2Fgocbcore-scripted-build-pipeline/detail/gocbcore-scripted-build-pipeline/2452/pipeline#step-775-log-743 Error: Not equal:
http://sdk.jenkins.couchbase.com/blue/organizations/jenkins/golang%2Fgocbcore%2Fgocbcore-scripted-build-pipeline/detail/gocbcore-scripted-build-pipeline/2452/pipeline#step-775-log-744 expected: 2
http://sdk.jenkins.couchbase.com/blue/organizations/jenkins/golang%2Fgocbcore%2Fgocbcore-scripted-build-pipeline/detail/gocbcore-scripted-build-pipeline/2452/pipeline#step-775-log-745 actual : 4
http://sdk.jenkins.couchbase.com/blue/organizations/jenkins/golang%2Fgocbcore%2Fgocbcore-scripted-build-pipeline/detail/gocbcore-scripted-build-pipeline/2452/pipeline#step-775-log-746 Test: TestDCPSuite/TestScopesBasic