The previous algorithm for comparing files used python's
dircmp and is considered to be a shallow comparision. This
allowed distinctly small possibilities that two files being
compared could be different but not caught.
We now use go-mtree to do the comparison. This can emulate the
shallow comparison we had before but we can also adding a
sha256digest as part of the comparison using the new --keywords
option.
Also, made slight tweaks to gomtree functions in Atomic.util
so we debug and influence the return of JSON data.
This solves https://github.com/projectatomic/atomic/issues/761
Closes: #777
Approved by: rhatdan
Basic tests for atomic diff and top which should catch
basic code regressions.
In top.py, added -n for number of iterations. And added
tty detection so that tests can pass in a jenkins environment
where there is no tty.
