torture: Permit double-quoted-string Kconfig options

Currently, the presence of any quoted-string Kconfig option in the
scenario files or the CFcommon file (aside from the special-cased
CONFIG_INITRAMFS_SOURCE option) will result in an "improperly set"
diagnostic.  This commit updates configcheck.sh to strip double quotes
in order to permit string-valued Kconfig options to be handled correctly.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/testing/selftests/rcutorture/bin/configcheck.sh

@@ -10,10 +10,9 @@
 T="`mktemp -d ${TMPDIR-/tmp}/configcheck.sh.XXXXXX`"
 trap 'rm -rf $T' 0
 
-cat $1 > $T/.config
+sed -e 's/"//g' < $1 > $T/.config
 
-cat $2 | sed -e 's/\(.*\)=n/# \1 is not set/' -e 's/^#CHECK#//' |
-grep -v '^CONFIG_INITRAMFS_SOURCE' |
+sed -e 's/"//g' -e 's/\(.*\)=n/# \1 is not set/' -e 's/^#CHECK#//' < $2 |
 awk	'
 {
 		print "if grep -q \"" $0 "\" < '"$T/.config"'";