opentsdb sink: scrub identifiers from disallowed characters
opentsdb sink: scrub identifiers from disallowed characters

huangyuqi/heapster,AlmogBaku/heapster,krzyzacy/heapster,piosz/heapster,mwringe/heapster,jackzampolin/heapster,bluebreezecf/heapster,shilpamayanna/heapster,burmanm/heapster,johanneswuerbach/heapster,bruceauyeung/heapster,mwringe/heapster,adfin/statster,whuwxl/heapster,liubog2008/heapster,Stackdriver/heapster,Stackdriver/heapster,jackzampolin/heapster,taimir/heapster,liubog2008/heapster,krzyzacy/heapster,andyxning/heapster,AlmogBaku/heapster,piosz/heapster,saiwl/heapster,andyxning/heapster,whuwxl/heapster,aegixx/heapster,luxas/heapster,saiwl/heapster,taimir/heapster,titilambert/heapster,bluebreezecf/heapster,johanneswuerbach/heapster,burmanm/heapster,luxas/heapster,shilpamayanna/heapster,bruceauyeung/heapster,adfin/statster,huangyuqi/heapster,aegixx/heapster,titilambert/heapster