[fix] rng() now outputs positive int and increased nginx name bucket

- [fix] changed od flag from -i to -d to generate unsigned numbers
 - the param -i can create negative numbers in dash
 - [fix] increased server_names_hash_bucket_size to 64
 - to accommodate for large domain names with (many) subdomains

proxy/files/entrypoint.sh

@@ -126,7 +126,7 @@ function read_file()
 
 function rng()
 {
-    rng_n=$(od -An -N2 -i < /dev/urandom)
+    rng_n=$(od -An -N2 -d < /dev/urandom)
     echo $rng_n
 }