Fix acl test to handle multiple IPs from dig

Dig command may return several IPs to properly handle them during
creation of network we should join lines from output into one with comma
 separator.

Signed-off-by: Petr Fedchenkov <giggsoff@gmail.com>

tests/eden/eclient/testdata/acl.txt

@@ -116,10 +116,11 @@ done
 -- dns_lookup.sh --
 
 # Performs DNS lookup for a given hostname and adds host_ip=<ip> into the .env file
+# If query returns several IPs they will be joined into one line with comma separator
 # Uses dig command which is already included by most modern Linux systems and also macOS.
 # Usage: dns_lookup.sh <hostname>
 
-IP=$(dig +short $1)
+IP=$(dig +short $1 | paste -sd "," -)
 echo host_ip=$IP>>.env
 
 -- curl.sh --