Use static import instead of dynamic include

When feasible, allows better tag/task filtering.

roles/coturn/tasks/main.yaml

@@ -1,6 +1,6 @@
 ---
 - name: 'install coturn'
-  include_role: name='service'
+  import_role: name='service'
   vars:
     service_name: 'coturn'
     service_packages:

roles/icinga2-monitoring/tasks/main.yaml

@@ -1,5 +1,4 @@
-- include_role:
-    name: 'service'
+- import_role: name='service'
   vars:
     service_name: 'icinga2'
   tags:

roles/ldap/tasks/1_configure_server.yaml

@@ -1,6 +1,5 @@
 ---
-- include_role:
-    name: 'service'
+- import_role: name='service'
   vars:
     service_name: 'nscd'
     service_packages: 'nscd'
@@ -17,8 +16,7 @@
     - { question: 'slapd/dump_database', value: 'when needed' }
     - { question: 'shared/organization', value: '{{ ldap_organization }}' }
 
-- include_role:
-    name: 'service'
+- import_role: name='service'
   vars:
     service_name: 'slapd'
     service_packages:

roles/nginx/tasks/main.yaml

@@ -1,6 +1,5 @@
 ---
-- include_role:
-    name: 'service'
+- import_role: name='service'
   vars:
     service_name: 'nginx'
     service_packages: