webos-image: Update layer pins for 2013-07-29

meta-webos as of 2013-07-29 16:34:19 -0700

390ba85 packagegroup-webos-extended: Include dhcp-client only for the emulator
b96a5df opkg: Put lock file in correct location
d317126 dropbear: Persist generated keys across software updates
c622be9 webos-image.bbclass: Optionally prepare rootfs to be read-only
6c4754c upstart: Add ROOTFS_READ_ONLY variable

Open-webOS-DCO-1.0-Signed-off-by: Susan Montooth <susan.montooth@lge.com>