Added some more test cases for `vis`ing and `unvis`ing
strings, and a test case that walks/checks a directory with
filenames that require encoding. Had to change Path() to account
for possible errors Unvis() could return. Refactored Vis()/Unvis() into
go-mtree tar functionality as well.
Signed-off-by: Stephen Chung <schung@redhat.com>
Perhaps this is not completely ideal, because it brings in cgo.
And with the flags, it can have tailored experience.
I've added a basic test to ensure that the cases we're interested in are
covered.
This does not yet integrate the usage of Vis()/Unviz() into the manifest
create and compare.
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
