__apt_update_index: ignore top level directory

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

cdist/conf/type/__apt_update_index/gencode-remote

@@ -20,7 +20,7 @@
 
 # run 'apt-get update' if anything in /etc/apt is newer then /var/lib/apt/lists
 cat << DONE
-if find /etc/apt -cnewer /var/lib/apt/lists | grep . > /dev/null; then
+if find /etc/apt -mindepth 1 -cnewer /var/lib/apt/lists | grep . > /dev/null; then
    apt-get update || apt-get update
 fi
 DONE