[split]  bump util to 6.3.4-SNAPSHOT
[split]  bump util to 6.3.4-SNAPSHOT

- release 6.3.3 of util
- update changelog

RB_ID=147309
TBR=true

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