At the moment, if freezer attempts to perform a backup with
the consistency check option enabled, it will fail if the
files being backed up contain anything other than plain
ASCII (or at least some flavour of same, ISO-8859-x
etc.). This is because the hashlib module fails as it
expects a string to digest rather than a binary blob.
This should fix matters by escaping everything that might
cause an issue and works for Python 2 and 3. Because it
escapes strings in a different way to before, the
checksums it computes may be different to previously
in some cases, but at least now it should always produce
one.
Change-Id: Idf62dc9e398c396c9de19cbff5622e79d4c7a198
Closes-Bug: #1595732
98c93e68a5