Update metric help to be more descriptive. #880

Job	Run time
build / Build	7m 32s
build-windows / Build	7m 10s
Integration Tests (windows)	46s
Integration Tests (certrotation)	1m 50s
Integration Tests (cacertrotation)	1m 50s
Integration Tests (custometcdargs)	47s
Integration Tests (startup)	7m 26s
Integration Tests (etcdrestore)	1m 57s
Integration Tests (longhorn)	2m 45s
Integration Tests (etcdsnapshot)	8m 22s
Integration Tests (kubeflags)	7m 3s
Integration Tests (localstorage)	1m 18s
Integration Tests (secretsencryption)	2m 23s
Integration Tests (flannelnone)	1m 7s
	52m 16s

Provide feedback