Remove unused printVersion variable (#3335)
Remove unused printVersion variable (#3335)

Kingpin now automatically does this via --version.
alileza/prometheus,AlekSi/prometheus,prometheus/prometheus,Conorbro/prometheus,AlekSi/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,keegancsmith/prometheus,kangwoo/prometheus,Conorbro/prometheus,brancz/prometheus,prometheus/prometheus,prometheus/prometheus,Stackdriver/stackdriver-prometheus,amorken/prometheus,GoogleCloudPlatform/prometheus,brancz/prometheus,alileza/prometheus,kangwoo/prometheus,yanghongkjxy/prometheus,yanghongkjxy/prometheus,alileza/prometheus,prometheus/prometheus,Conorbro/prometheus,brancz/prometheus,alileza/prometheus,kangwoo/prometheus,amorken/prometheus,Gouthamve/prometheus,AlekSi/prometheus,kangwoo/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,amorken/prometheus,yanghongkjxy/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,amorken/prometheus,Conorbro/prometheus,Gouthamve/prometheus,Stackdriver/stackdriver-prometheus,Stackdriver/stackdriver-prometheus,Stackdriver/stackdriver-prometheus,keegancsmith/prometheus,brancz/prometheus,AlekSi/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,yanghongkjxy/prometheus,alileza/prometheus