ensure file exists

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

cdist/conf/type/__timezone/manifest

@@ -41,7 +41,11 @@ case "$os" in
     centos)
         __package tzdata --state present
         export require="__package/tzdata"
-        __key_value ZONE \
+        __file /etc/sysconfig/clock \
+            --owner root --group root --mode 644 \
+            --state exists
+        require="__file/etc/sysconfig/clock" \
+            ___key_value ZONE \
                 --file /etc/sysconfig/clock \
                 --delimiter '=' \
                 --value "\"$timezone\""