[split] bump util to 6.4.1-SNAPSHOT
[split] bump util to 6.4.1-SNAPSHOT

RB_ID=178076
TBR=true

twitter/ostrich,hydro2k/ostrich,yonglehou/ostrich,travisbrown/ostrich,cogitate/twitter-ostrich-uuid,travisbrown/ostrich,yeghishe/ostrich,twitter/ostrich,twitter/ostrich,travisbrown/ostrich,hydro2k/ostrich,yonglehou/ostrich,cogitate/twitter-ostrich-uuid,twitter/ostrich,hydro2k/ostrich,travisbrown/ostrich,yonglehou/ostrich,yonglehou/ostrich,yonglehou/ostrich,cogitate/twitter-ostrich-uuid,twitter/ostrich,yeghishe/ostrich,cogitate/twitter-ostrich-uuid,yeghishe/ostrich,travisbrown/ostrich,hydro2k/ostrich,cogitate/twitter-ostrich-uuid,yeghishe/ostrich,yeghishe/ostrich,hydro2k/ostrich