Merge changes I598c8c5c,I672b0f4d,Id882978b,Idff5e080,Ib124eca1, ...

* changes:
  logger.h: reduce maximum payload so sum is page size
  liblog: test for maximum payload can not survive change
  liblog: logprint use uid name if length less then 5
  liblog: logprint add uid format modifier
  liblog: readlog apps get logger_entry_v4 for pstore
  logd: readlog apps get logger_entry_v4
  logger.h: Add definition for logger_entry_v4