blkid: Output non-printing characters using ^ and M- notation

blkid: Output non-printing characters using ^ and M- notation

When printing the value of tags in a formatted format, print control
characters and characters with the high eight bit set using the ^ and
M- notation, respectively.  This prevents a filesystem with a garbage
label from potentially screwing up the user's screen (for example,
putting it into graphical mode).

Addresses-Ubuntu-Bug: #78087

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>