remove 'start networking' from cloud-init-nonet

do not 'start networking' in cloud-init-nonet, but add
cloud-init-container job that runs only if in container and emits
net-device-added (LP: #1031065)

ChangeLog

@@ -1,4 +1,7 @@
 0.7.0:
+ - do not 'start networking' in cloud-init-nonet, but add
+   cloud-init-container job that runs only if in container and emits
+   net-device-added (LP: #1031065)
  - search only top level dns for 'instance-data' in DataSourceEc2 (LP: #1040200)
  - add support for config-drive-v2 (LP:#1037567)
  - support creating users, including the default user.

upstart/cloud-init-container.conf

@@ -0,0 +1,51 @@
+# in a lxc container, events for network interfaces do not
+# get created or may be missed.  This helps cloud-init-nonet along
+# by emitting those events if they have not been emitted.
+
+start on container
+stop on static-network-up
+task
+
+emits net-device-added
+
+console output
+
+script
+   # if we are inside a container, then we may have to emit the ifup
+   # events for 'auto' network devices.
+   set -f
+
+   # from /etc/network/if-up.d/upstart
+   MARK_DEV_PREFIX="/run/network/ifup."
+   MARK_STATIC_NETWORK_EMITTED="/run/network/static-network-up-emitted"
+   # if the all static network interfaces are already up, nothing to do
+   [ -f "$MARK_STATIC_NETWORK_EMITTED" ] && exit 0
+
+   # get list of all 'auto' interfaces. if there are none, nothing to do.
+   auto_list=$(ifquery --list --allow auto 2>/dev/null) || :
+   [ -z "$auto_list" ] && exit 0
+   set -- ${auto_list}
+   [ "$*" = "lo" ] && exit 0
+
+   # we only want to emit for interfaces that do not exist, so filter
+   # out anything that does not exist.
+   for iface in "$@"; do
+      [ "$iface" = "lo" ] && continue
+      # skip interfaces that are already up
+      [ -f "${MARK_DEV_PREFIX}${iface}" ] && continue
+
+      if [ -d /sys/net ]; then
+         # if /sys is mounted, and there is no /sys/net/iface, then no device
+         [ -e "/sys/net/$iface" ] && continue
+      else
+         # sys wasn't mounted, so just check via 'ifconfig'
+         ifconfig "$iface" >/dev/null 2>&1 || continue
+      fi
+      initctl emit --no-wait net-device-added "INTERFACE=$iface" &&
+         emitted="$emitted $iface" ||
+         echo "warn: ${UPSTART_JOB} failed to emit net-device-added INTERFACE=$iface"
+   done
+
+   [ -z "${emitted# }" ] ||
+      echo "${UPSTART_JOB}: emitted ifup for ${emitted# }"
+end script

upstart/cloud-init-nonet.conf

@@ -18,8 +18,6 @@ script
 
    [ -f /var/lib/cloud/instance/obj.pkl ] && exit 0
 
-   start networking >/dev/null
-
    short=10; long=120;
    sleep ${short}
    echo $UPSTART_JOB "waiting ${long} seconds for a network device."