systemd: use network-online instead of network.target (LP: #1440180)

don't declare a Wants/Requires on network.target; this is a passive target
that should only be pulled in by implementors of the networking service.
The requirement for network needs to be expressed as a dependency on
network-online.target.

LP: #1440180

ChangeLog

@@ -30,6 +30,8 @@
  - SmartOS: use v2 metadata service (LP: #1436417) [Daniel Watkins]
  - NoCloud: fix local datasource claiming found without explicit dsmode
  - Snappy: add support for installing snappy packages and configuring.
+ - systemd: use network-online instead of network.target (LP: #1440180)
+   [Steve Langasek]
 0.7.6:
  - open 0.7.6
  - Enable vendordata on CloudSigma datasource (LP: #1303986)

systemd/cloud-config.service

 [Unit]
 Description=Apply the settings specified in cloud-config
-After=network.target cloud-config.target syslog.target
-Wants=network.target cloud-config.target
+After=network-online.target cloud-config.target syslog.target
+Wants=network-online.target cloud-config.target
 
 [Service]
 Type=oneshot

systemd/cloud-final.service

 [Unit]
 Description=Execute cloud user/final scripts
-After=network.target cloud-config.service syslog.target rc-local.service
-Wants=network.target cloud-config.service
+After=network-online.target cloud-config.service syslog.target rc-local.service
+Wants=network-online.target cloud-config.service
 
 [Service]
 Type=oneshot

systemd/cloud-init.service

 [Unit]
 Description=Initial cloud-init job (metadata service crawler)
-After=local-fs.target network.target cloud-init-local.service
+After=local-fs.target network-online.target cloud-init-local.service
 Before=sshd.service sshd-keygen.service systemd-user-sessions.service
-Requires=network.target
+Requires=network-online.target
 Wants=local-fs.target cloud-init-local.service sshd.service sshd-keygen.service
 
 [Service]