Force-delete progress file for integration tests
Force-delete progress file for integration tests

Previously running runintegrationtests.sh from clean would
fail due to the lack of a progress file: rm stops if it can't find the file you
request to be deleted. Adding -f fixes this.
jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,evildour/google-cloud-dotnet,evildour/google-cloud-dotnet,evildour/google-cloud-dotnet,benwulfe/google-cloud-dotnet,chrisdunelm/gcloud-dotnet,chrisdunelm/google-cloud-dotnet,jskeet/google-cloud-dotnet,chrisdunelm/google-cloud-dotnet,googleapis/google-cloud-dotnet,benwulfe/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/gcloud-dotnet,benwulfe/google-cloud-dotnet,jskeet/google-cloud-dotnet,chrisdunelm/google-cloud-dotnet,iantalarico/google-cloud-dotnet,googleapis/google-cloud-dotnet,iantalarico/google-cloud-dotnet,iantalarico/google-cloud-dotnet,googleapis/google-cloud-dotnet