Disable overriding sigchecks.

Until this is redetermined as a problem lets leave this out,
so that next time when its needed we can put a better message
as to why its needed. Bad josh.

Change-Id: I82ef13a31834a9e5bf2dde3b8c7ff7f207972256
Use the shell helper chown_r

Instead of using the shell execute command to
do the equivalent use the shell functions to
do the same. This allows us to detect when a user
or group does not exist as well as to indivually
report chown failures, instead of just silently
dropping said errors.

Change-Id: I73452de0034c44de1812bb2163cf8b0142910773
Merge "Use the shell helper chown_r"
Merge "Disable overriding sigchecks."