[PATCH] mock simple fixes

[Dan Williams]

1) Fixes traceback when the buildroot directory doesn't exist (which
will be the case when we start specifying buildroots on the mock command
line)

2) Fixes traceback when Root() fails for some reason (wrong user/group
config, mock user doesn't exist with same GID as the mock executable,
etc)

If it looks OK, I can apply.

Dan
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