meta-phosphor: add ipv4/ipv6 DISTRO_FEATURES

DISTRO_FEATURES_LIBC was removed from upstream poky in 2.7 (see
ref-manual/migration.xml), and we use to get ipv4 and ipv6 picked
up as DISTRO_FEATURES as a side-effect of this variable.  It was
reported that ipv6 tools were missing from the image, so add this
back directly as a DISTRO_FEATURE.

Also, sort DISTRO_FEATURES_DEFAULT and remove any reference to the
now-deprecated DISTRO_FEATURES_LIBC.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I3cd0c4dbef63a3812bf7e7c0d3b29c89a420c97b
diff --git a/conf/distro/include/phosphor-base.inc b/conf/distro/include/phosphor-base.inc
index 31e669b..8d53c8d 100644
--- a/conf/distro/include/phosphor-base.inc
+++ b/conf/distro/include/phosphor-base.inc
@@ -104,16 +104,17 @@
 
 DISTRO_FEATURES_DEFAULT = " \
         avahi \
+        ipv4 \
+        ipv6 \
+        ldap \
+        libc-inet-anl \
         pam \
         slp \
         systemd \
-        ldap \
-        libc-inet-anl \
         "
 
 DISTRO_FEATURES += " \
         ${DISTRO_FEATURES_DEFAULT} \
-        ${DISTRO_FEATURES_LIBC} \
         ${DISTRO_FEATURES_OBMC} \
         "