collectd: make sure /run/collectd exists (#189)

this could cause kinda serious issues with the IO reduction things
graphs1090 readback script also changed to avoid those issues in the
future

rootfs/etc/s6-overlay/scripts/collectd

@@ -3,6 +3,9 @@
 
 source /scripts/common
 
+# make sure /run/collectd exists
+mkdir -p /run/collectd
+
 
 if chk_enabled "${GRAPHS1090_DISABLE}" || chk_enabled "${TAR1090_DISABLE}"; then
     exec sleep infinity

rootfs/etc/s6-overlay/startup.d/08-graphs1090-init

@@ -4,7 +4,6 @@
 source /scripts/common
 
 mkdir -p /run/graphs1090
-mkdir -p /run/collectd/localhost
 
 # If ${GRAPHS1090_DISABLE} is set, remove access to the graphs1090 website. We don't need to worry about putting this file back
 # after graphs1090 is re-enabled, because when changing env params, the container MUST be recreated.