fix ansible v2.8 warnings

basic-system/tasks/logging.yml

@@ -4,7 +4,7 @@
 - name: restrict dmesg access to only root
   sysctl:
     name: kernel.dmesg_restrict
-    value: 1
+    value: '1'
     state: present
     sysctl_set: true
   tags:

basic-system/tasks/network.yml

@@ -54,7 +54,7 @@
 - name: ensure deactivation of tcp_timestamps
   sysctl:
     name: net.ipv4.tcp_timestamps
-    value: 0
+    value: '0'
     state: present
     sysctl_set: true
   tags:
@@ -64,7 +64,7 @@
 - name: ensure deactivation of ipv6 tempaddr (all)
   sysctl:
     name: net.ipv6.conf.all.use_tempaddr
-    value: 0
+    value: '0'
     state: present
     sysctl_set: true
   tags:
@@ -74,7 +74,7 @@
 - name: ensure deactivation of ipv6 tempaddr (default)
   sysctl:
     name: net.ipv6.conf.default.use_tempaddr
-    value: 0
+    value: '0'
     state: present
     sysctl_set: true
   tags: