Bug 10690

Description of problem:
getVarsFromSh read variables from a shell compatible config file.

However, when variable is quoted with double quotes, it doesn't read correctly.

consider a file with the following line:

FOO="foo\"bar\\aaa\nbbb"

if you source that file from bash, and then do "echo $FOO"
it wll display: foo"bar\aaa\nbbb

but if you read the file with getVarsFromSh it will display: foo\"bar\\aaa\nbbb

as getVarsFromSh() is intended to be shell-compatible, this is clearly a bug.
for strings in double quotes, the backslash has a special meaning when
in front of a double quote or another backslash.

How to fix it?
the function is defined in MDK/Common/System.pm file
it should be changed as follow:

sub getVarsFromSh {
    my %l;
    open(my $F, $_[0]) or return;
    local $_;
    while (<$F>) {
	s/^\s*#.*//; # remove comment-only lines
	s/^\s*//; # leading space
	my ($v, $val) = /^(\w+)=(.*)/ or next;
	if ($val =~ /^"(.*)"(\s+#.*)?$/) {
	    $val = $1;
	    $val =~ s/\\(["\\])/$1/g; # <---- add this line
	} elsif ($val =~ /^'(.*)'(\s+#.*)?$/) {
	    $val = $1;
	    $val =~ s/(^|[^'])'\\''/$1'/g;
	}
	$l{$v} = $val;
    }
    %l;
}



Thanks

Reproducible: 

Steps to Reproduce: