xueweiz: Allow problem daemon plugins to define their command line options

JobBuild
348
11-05 23:42
ci-npd-e2e-test 1204905762694893575
pull-npd-build 1191863435478962179
pull-npd-e2e-kubernetes-gce-gci 1191863435478962177
pull-npd-e2e-kubernetes-gce-gci-custom-flags 1191863435478962180
pull-npd-e2e-kubernetes-gce-ubuntu 1191863435483156480
pull-npd-e2e-kubernetes-gce-ubuntu-custom-flags 1191863435483156481
pull-npd-e2e-node 1191863435478962178
pull-npd-e2e-test 1214313112883171328
pull-npd-test 1191863435478962176