poky.conf: Switch to post release name/version

(From meta-yocto rev: 803ef4a3f2304350484d2993fc0e811a6d8e1fa7)

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/distro/poky.conf

@@ -1,7 +1,7 @@
 DISTRO = "poky"
 DISTRO_NAME = "Poky (Yocto Project Reference Distro)"
-DISTRO_VERSION = "4.2"
-DISTRO_CODENAME = "mickledore"
+DISTRO_VERSION = "4.2+snapshot-${METADATA_REVISION}"
+DISTRO_CODENAME = "nanbield"
 SDK_VENDOR = "-pokysdk"
 SDK_VERSION = "${@d.getVar('DISTRO_VERSION').replace('snapshot-${METADATA_REVISION}', 'snapshot')}"
 SDK_VERSION[vardepvalue] = "${SDK_VERSION}"