message: Migrate fb303 thrift files to hack namespace
  Summary: Migrating from php to hack namespace
diff: @@ -19,7 +19,7 @@ namespace java.swift com.facebook.swift.fb303.core
  namespace cpp facebook.fb303
  namespace py.asyncio fb303_asyncio.fb303_core
  namespace perl fb303
  -namespace php fb303
  +namespace hack fb303
  namespace node_module fb303
  namespace go fb303.thrift.fb303_core
  