... which handles merge when boot completed. It also
dumps debug information when requested.
Bug: 135752105
Test: adb shell su 0 snapshotctl dump
Test: call snapshotctl merge at different stage of OTA:
- before OTA (exit normally)
- during OTA is applied (exit with error)
- after OTA is applied but before reboot (exit with error)
- after reboot (finish merge and exit normally)
- Manually stop its execution during merge and run again
(finish merge and exit normally)
Change-Id: Idcc6aea8d7bbeb9a1a288c966b8f5e14b3f6a3e7
2feb47a29b