Add systemd tags to include role

There are times when a deployer will need to reconfigure parts of
an environment and having a general purpose tag to run said operation
will be important especicially should the deployer be needing to
reconfigure systemd unit files in a downtime event. This change adds
a general purpose systemd tag where include_role and systemd is found
which will assit operators with day2 operational tasks.

Change-Id: I8a007c62e110c96fce4fc687258af0b4ef7b3ab1
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

tasks/nspawn_networking.yml

@@ -103,6 +103,7 @@
         state: started
   tags:
     - network-config
+    - systemd-networkd
 
 - name: Run the systemd-networkd role
   include_role:
@@ -155,6 +156,7 @@
       {{ _networks | sort(attribute='interface') }}
   tags:
     - network-config
+    - systemd-networkd
 
 - name: Create dnsmasq config(s)
   template:
@@ -214,3 +216,4 @@
     loop_var: dnsmasq_var
   tags:
     - network-config
+    - systemd-service

tasks/nspawn_volume.yml

@@ -75,6 +75,9 @@
               - "/lib/systemd/systemd-machined"
             enabled: yes
             state: started
+      tags:
+        - machines-config
+        - systemd-service
 
     - name: Run the systemd mount role
       include_role:
@@ -89,6 +92,7 @@
             state: 'started'
             enabled: true
       tags:
+        - systemd-mount
         - machines-config
   when:
     - machinectl_mount.rc != 0