[split] util-app Flags: Add support for long
[split] util-app Flags: Add support for long

RB_ID=161125

BuoyantIO/twitter-util,luciferous/util,wuqiangxjtu/util,RUNDSP/util,stremlenye/util,tenghuihua/util,slackhappy/util,tdyas/util,wuqiangxjtu/util,nkhuyu/util,luciferous/util,luciferous/util,tdyas/util,LitmusHealth/twitter-utils,edombowsky/util,tenghuihua/util,slackhappy/util,BuoyantIO/twitter-util,tdyas/util,cogitate/twitter-util-uuid,twitter/util,cogitate/twitter-util-uuid,travisbrown/util,LitmusHealth/twitter-utils,luciferous/util,slackhappy/util,mosesn/util,Jiri-Kremser/util,folone/util,Jiri-Kremser/util,twitter/util,hydro2k/util,stremlenye/util,RUNDSP/util,LitmusHealth/twitter-utils,BuoyantIO/twitter-util,mosesn/util,edombowsky/util,tdyas/util,hydro2k/util,edombowsky/util,hydro2k/util,mosesn/util,Jiri-Kremser/util,travisbrown/util,Jiri-Kremser/util,tenghuihua/util,BuoyantIO/twitter-util,RUNDSP/util,stremlenye/util,hydro2k/util,tenghuihua/util,RUNDSP/util,LitmusHealth/twitter-utils,slackhappy/util,nkhuyu/util,folone/util,nkhuyu/util,wuqiangxjtu/util,folone/util,stremlenye/util,cogitate/twitter-util-uuid,wuqiangxjtu/util,twitter/util,edombowsky/util,nkhuyu/util,travisbrown/util,cogitate/twitter-util-uuid,travisbrown/util,folone/util