OTA: Missing lines for exit status

Change-Id: I0570f0aed1caff321b55a7242bf2095370723103
OTA: Change verification method (2/2)

Since getprop is not always accurate, get ro.modversion directly from
/system/build.prop instead

Change-Id: Ic1c9f21e0807da614657fdc5d313dfe126afe30f
OTA: Make recovery show stuff when patching

Change-Id: I978450fd6c0fc7b58790be02917cac075a1309e7
OTA: Code cleanup

Change-Id: If4747dde54fa08de9aea049be652a2768409e8ee
OTA: Unmount /system if aborting

And some code cleanup again

Change-Id: Ibebaeb12d0461e981e356c2c96d250d453d7322a