classes/rootfs_rpm: fix missed complementary packages with complex arch names

If the package architecture name is complex (e.g. with the meta-yocto-bsp
beagleboard machine and Poky, the architecture-specific package name is
"armv7a-vfp-neon"), rpm reports architecture names that contain
underscores instead of dashes, which when passed to oe-pkgdata-util
during complementary package processing did not match a valid pkginfo
path. Replacing the underscores with dashes again fixes the issue.

Note that this bug affects the danny branch and not master since the
substitution is already performed there in a different manner.

Fixes [YOCTO #3792]

(From OE-Core rev: e29daf8c3eeb7273e63b6ca6d774b8803880ca46)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/rootfs_rpm.bbclass

@@ -151,7 +151,7 @@ list_installed_packages() {
 
 	# print the info, need to different return counts
 	if [ "$1" = "arch" ] ; then
-		echo "$GET_LIST" | awk '{print $1, $2}'
+		echo "$GET_LIST" | awk '{PN=$1; gsub("_", "-"); print PN, $2}'
         elif [ "$1" = "file" ] ; then
 		echo "$GET_LIST" | awk '{print $1, $3}'
         else