bootznalyze bug fix and minor improvements

- should decode with utf8 for all string from shell command
- remove dependency on kernel start time in logcat as boot complete
  is enough with auto time update disabled.
- expand launcher match string

Bug: 198205714
Bug: 204450693
Test: ./system/extras/boottime_tools/bootanalyze/bootanalyze.py -c ./system/extras/boottime_tools/bootanalyze/config.yaml -r -n 2 -t -v
Change-Id: I25ccc81baa06cadc9390d1f948ecb0fe74302599
2 files changed