bug in parsing escaped characters in dquoted string

[BVK]

Hi,


Current parsers (rescue-mode and sh-mode) parses don't seem to handle
escape characters in double quoted strings like the way bash does.
For example, in bash

echo "\""

prints single double quote character with escape processing and

echo "\a"

prints two characters without escape processing.


But grub parsers are not handling the first case.  Attached patch
fixes this issue.



thanks,
-- 
bvk-chaitanya

escaped-dquote-in-dquote-string.patch
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