The current family of '--set' methods interprets some special characters
in values (e.g. commas, square brackets, points, backslashes). With the
typical shell escaping rules, this can increase the difficulty of overwriting
values in some cases.
In contrast to '--set-string' or similar methods, '--set-literal' does
not interpret those special characters. It interprets given values as
literal strings.
Example:
--set-literal outer.inner='so\me,values'
outer:
inner: so\me,values
Closes#4030
Signed-off-by: Patrick Scheid <p.scheid92@gmail.com>