abansal4032: Add logging levels to custom plugin logs.

JobBuild
459
08-28 23:25
pull-npd-build 1299488278344372227
pull-npd-e2e-kubernetes-gce-gci 1299488278340177920
pull-npd-e2e-kubernetes-gce-gci-custom-flags 1299488278344372224
pull-npd-e2e-kubernetes-gce-ubuntu 1299488278344372226
pull-npd-e2e-kubernetes-gce-ubuntu-custom-flags 1299488278348566528
pull-npd-e2e-node 1299488278344372225
pull-npd-e2e-test 1299488278340177921
pull-npd-test 1299488278344372228